Relevant bibliographies by topics / Laser Molecular Interaction

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Laser Molecular Interaction'

Author: Grafiati
Published: 7 September 2023

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Journal articles on the topic "Laser Molecular Interaction"

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Kodama, R. "Study of X-ray laser interaction plasmas." Laser and Particle Beams 10, no. 4 (December 1992): 821–26. http://dx.doi.org/10.1017/s0263034600004778.

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Atomic processes in X-ray laser interaction plasmas are investigated by using a collisional-radiative model. Population inversions on free-bound transitions can be produced by photoionization above a threshold of incident X-ray laser intensity and lead to stimulated free-bound emission (SFBE). Free-bound lasers pumped by intense X-ray lasers are proposed and their feasibility is investigated simply considering X-ray laser interaction plasmas.
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Holkundkar, Amol R., Gaurav Mishra, and N. K. Gupta. "Molecular dynamic simulation for laser–cluster interaction." Physics of Plasmas 18, no. 5 (May 2011): 053102. http://dx.doi.org/10.1063/1.3581061.

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Drake, R. Paul. "Laser–plasma-interaction experiments using multikilojoule lasers." Laser and Particle Beams 6, no. 2 (May 1988): 235–44. http://dx.doi.org/10.1017/s0263034600003980.

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This paper summarizes the results of several laser–plasma-interaction experiments using multikilojoule lasers, and considers their implications for laser fusion. The experiments used 1·06-, 0·53-, 0·35-, and 0·26-μm light to produce relatively large, warm, planar plasmas and to study the effect of laser wavelength and density-gradient scale length on the Stimulated Raman Scattering and on the scattering of light at frequencies near the incident laser frequencey by Stimulated Brillouin Scattering or other processes. The results of these experiments suggest that some laser wavelength between 0·2 and 0·6 μm will be required for high-gain laser fusion.
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Lalanne, Jean Rene. "Laser‐Molecule Interaction." Optical Engineering 35, no. 12 (December 1, 1996): 3642. http://dx.doi.org/10.1117/1.601119.

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Yin, C. P., S. T. Zhang, Y. W. Dong, Q. W. Ye, and Q. Li. "Molecular-dynamics study of multi-pulsed ultrafast laser interaction with copper." Advances in Production Engineering & Management 16, no. 4 (December 18, 2021): 457–72. http://dx.doi.org/10.14743/apem2021.4.413.

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Ultrafast laser has an undeniable advantage in laser processing due to its extremely small pulse width and high peak energy. While the interaction of ultrafast laser and solid materials is an extremely non-equilibrium process in which the material undergoes phase transformation and even ablation in an extremely short time range. This is the coupling of the thermos elastic effect caused by the pressure wave and the superheated melting of the material lattice. To further explore the mechanism of the action of ultrafast laser and metal materials, the two-temperature model coupling with molecular dynamics method was used to simulate the interaction of the copper and laser energy. Firstly, the interaction of single-pulsed laser and copper film was reproduced, and the calculated two-temperature curve and the visualized atomic snapshots were used to investigate the influence of laser parameters on the ablation result. Then, by changing the size of the atomic system, the curve of ablation depth as a function of laser fluence was obtained. In this paper, the interaction of multi-pulsed laser and copper was calculated. Two-temperature curve and temperature contour of copper film after the irradiation of double-pulsed and multi-pulsed laser were obtained. And the factors which can make a difference to the incubation effect were analyzed. By calculating the ablation depth under the action of multi-pulsed laser, the influence of the incubation effect on ablation results was further explored. Finally, a more accurate numerical model of laser machining metal is established and verified by an ultra-short laser processing experiment, which provides a new calculation method and theoretical basis for ultra-fast laser machining of air film holes in aviation turbine blades, and has certain practical guiding significance for laser machining.
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Bobin, J. L. "Laser plasma interaction." Physica Scripta T30 (January 1, 1990): 77–89. http://dx.doi.org/10.1088/0031-8949/1990/t30/012.

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Smarandache, Adriana. "Laser Beams Interaction with Polidocanol Foam: Molecular Background." Photomedicine and Laser Surgery 30, no. 5 (May 2012): 262–67. http://dx.doi.org/10.1089/pho.2011.3187.

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Ashmarin, I. I., Yu A. Bykovskiĭ, B. S. Podol'skiĭ, M. M. Potapov, and A. A. Chistyakov. "Selective interaction of laser radiation with molecular crystals." Soviet Journal of Quantum Electronics 15, no. 9 (September 30, 1985): 1259–62. http://dx.doi.org/10.1070/qe1985v015n09abeh007704.

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De Moor, Roeland Jozef Gentil, Jeroen Verheyen, Peter Verheyen, Andrii Diachuk, Maarten August Meire, Peter Jozef De Coster, Mieke De Bruyne, and Filip Keulemans. "Laser Teeth Bleaching: Evaluation of Eventual Side Effects on Enamel and the Pulp and the Efficiency In Vitro and In Vivo." Scientific World Journal 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/835405.

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Light and heat increase the reactivity of hydrogen peroxide. There is no evidence that light activation (power bleaching with high-intensity light) results in a more effective bleaching with a longer lasting effect with high concentrated hydrogen peroxide bleaching gels. Laser light differs from conventional light as it requires a laser-target interaction. The interaction takes place in the first instance in the bleaching gel. The second interaction has to be induced in the tooth, more specifically in the dentine. There is evidence that interaction exists with the bleaching gel: photothermal, photocatalytical, and photochemical interactions are described. The reactivity of the gel is increased by adding photocatalyst of photosensitizers. Direct and effective photobleaching, that is, a direct interaction with the colour molecules in the dentine, however, is only possible with the argon (488 and 415 nm) and KTP laser (532 nm). A number of risks have been described such as heat generation. Nd:YAG and especially high power diode lasers present a risk with intrapulpal temperature elevation up to 22°C. Hypersensitivity is regularly encountered, being it of temporary occurrence except for a number of diode wavelengths and the Nd:YAG. The tooth surface remains intact after laser bleaching. At present, KTP laser is the most efficient dental bleaching wavelength.
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Fahdiran, Riser, and Herbert M. Urbassek. "Laser Ablation of Nanoparticles: A Molecular Dynamics Study." Advanced Materials Research 1112 (July 2015): 120–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1112.120.

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We study laser ablation of nanoparticles (NPs). The interaction of a high-intensity laser pulse with NPs brings the NP into a highly non-equilibrium state. Depending on the energy input from the laser, it will melt and may fragment and evaporate off atoms and clusters. We employ molecular dynamics simulation to study this interaction since thermodynamic properties can be extracted from output data of this simulation. The interatomic interaction is modeled by a Lennard-Jones (LJ) potential. The intensity of the laser is above the ablation threshold. The NP has been chosen to have a spherical shape with diameter 50 s in LJ units. The laser energy is given to the NP instantaneously at the beginning of the simulation and homogenously to all atoms; it corresponds to an energy input of 5.4 e per atom. The simulation is continued up to a time 200 t in LJ units. Temperature-density phase-space trajectories show that the nanoparticle density and temperature strongly decrease after the irradiation. The pressure in the sphere becomes strongly tensile after irradiation. The ablation proceeds by spallation of the irradiated cluster. We provide an analysis of the fragments produced by the ablation of the spherical NP. Our results are contrasted to the case of laser ablation of a thin-film target.
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Dissertations / Theses on the topic "Laser Molecular Interaction"

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Gacek, Sobieslaw Stanislaw. "Molecular dynamics simulation of shock waves in laser-material interaction." [Ames, Iowa : Iowa State University], 2009.

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Madden, Colette Sarah. "An investigation of InXe interaction potentials using laser induced fluorescence techniques." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334482.

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Bergh, Magnus. "Interaction of Ultrashort X-ray Pulses with Material." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8274.

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Gupta, Ayush. "Interaction of intense short laser pulses with gases of nanoscale atomic and molecular clusters." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3913.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.
Thesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Zeng, Shuo. "Understanding diatomic molecular dynamics triggered by a few-cycle pulse." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/19165.

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Doctor of Philosophy
Physics
Brett D. Esry
In strong field physics, complex atomic and molecular motions can be triggered and steered by an ultrashort strong field. With a given pulse as an carrier-envelope form, E(t) = E₀(t) cos(ωt + φ), we established our photon-phase formalism to decompose the solution of a time-dependent Schrödinger equation in terms of photons. This formalism is further implemented into a general analysis scheme that allows extract photon information direct from the numerical solution. The φ-dependence of any observables then can be understood universally as an interference effect of different photon channels. With this established, we choose the benchmark system H₂⁺ to numerically study its response to an intense few-cycle pulse. This approach helps us identify electronic, rovibrational transitions in terms of photon channels, allowing one to discuss photons in the strong field phenomena quantitatively. Furthermore, the dissociation pathways are visualized in our numerical calculations, which help predicting the outcome of dissociation. Guided by this photon picture, we explored the dissociation in a linearly polarized pulse of longer wavelengths (compared to the 800 nm of standard Ti:Saphire laser). We successfully identified strong post-pulse alignment of the dissociative fragments and found out that such alignment exists even for heavy molecules. More significant spatial asymmetry is confirmed in the longer wavelength regime, because dissociation is no longer dominated by a single photon process and hence allowed for richer interference. Besides, quantitative comparison between theory and experiment have been conducted seeking beyond the qualitative features. The discrepancy caused by different experimental inputs allows us to examine the assumptions made in the experiment. We also extend numerical studies to the dissociative ionization of H₂ by modeling the ionization.
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Kjellsson, Lindblom Tor. "Relativistic light-matter interaction." Doctoral thesis, Stockholms universitet, Fysikum, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-147749.

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During the past decades, the development of laser technology has produced pulses with increasingly higher peak intensities. These can now be made such that their strength rivals, and even exceeds, the atomic potential at the typical distance of an electron from the nucleus. To understand the induced dynamics, one can not rely on perturbative methods and must instead try to get as close to the full machinery of quantum mechanics as practically possible. With increasing field strength, many exotic interactions such as magnetic, relativistic and higher order electric effects may start to play a significant role. To keep a problem tractable, only those effects that play a non-negligible role should be accounted for. In order to do this, a clear notion of their relative importance as a function of the pulse properties is needed.  In this thesis I study the interaction between atomic hydrogen and super-intense laser pulses, with the specific aim to contribute to the knowledge of the relative importance of different effects. I solve the time-dependent Schrödinger and Dirac equations, and compare the results to reveal relativistic effects. High order electromagnetic multipole effects are accounted for by including spatial variation in the laser pulse. The interaction is first described using minimal coupling. The spatial part of the pulse is accounted for by a series expansion of the vector potential and convergence with respect to the number of expansion terms is carefully checked. A significantly higher demand on the spatial description is found in the relativistic case, and its origin is explained. As a response to this demanding convergence behavior, an alternative interaction form for the relativistic case has been developed and presented. As a guide mark for relativistic effects, I use the classical concept of quiver velocity, vquiv, which is the peak velocity of a free electron in the polarization direction of a monochromatic electromagnetic plane wave that interacts with the electron. Relativistic effects are expected when vquiv reaches a substantial fraction of the speed of light c, and in this thesis I consider cases up to vquiv=0.19c. For the present cases, relativistic effects are found to emerge around vquiv=0.16c .
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WAN, JINGFANG. "In Situ Optically Trapped Probing System for Molecular Recognition and Localization." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250626752.

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Higuet, Julien. "Etudes structurelles et dynamiques de systèmes atomiques ou moléculaires par génération d'harmoniques d'ordre élevé." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14078/document.

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La génération d'harmoniques d'ordre élevé en milieu gazeux est un phénomène décrit par un modèle à trois étapes: sous l'effet d'un champ laser intense, un atome (ou une molécule) est ionisé par effet tunnel. L'électron éjecté est par la suite accéléré dans le champ laser, avant de se recombiner sur son ion parent en émettant un photon XUV. D'abord utilisée dans le but de développer des sources de rayonnement secondaire dans le domaine XUV, la génération d'harmoniques d'ordre élevé est également un bon candidat pour sonder la structure électronique des atomes ou des molécules, avec une résolution potentielle de l'ordre de l'attoseconde dans le domaine temporel (1 as=10-18 s) et sub-nanométrique dans le domaine spatial.Au cours des travaux réalisés pendant cette thèse, nous avons étudié la sensibilité des caractéristiques du rayonnement harmonique (amplitude, état de polarisation, phase) à la structure électronique du milieu de génération. Ces études ont été menées tout d'abord dans un milieu atomique couramment utilisé en génération d'harmonique, l'argon, puis dans des milieux moléculaires (N2, CO2, O2). La confrontation de ces mesures avec différentes simulations numériques montre la nécessité de modéliser de façon détaillée le processus de génération, dépassant certaines hypothèses généralement admises.Nous avons également montré la possibilité d'utiliser la spectroscopie d'harmoniques d'ordre élevé afin de mesurer des dynamiques moléculaires de systèmes complexes (notamment le dioxyde d'azote NO2), pour lesquelles les mesures harmoniques peuvent obtenir des résultats complémentaires aux autres techniques couramment utilisées. Dans le cas d'excitations moléculaires peu efficaces, nous avons pu adapter des techniques de spectroscopie optique conventionnelle au domaine spectral des harmoniques d'ordre élevé, améliorant de manière significative le rapport signal/bruit
High harmonic generation is a well known phenomenon explained by a “three step” model: because of the high intensity field generated by an ultrashort laser pulse, an atom or a molecule can be tunnel ionized. The ejected electron is then accelerated by the intense electric field, and eventually can recombine on its parent ion, leading to the emission of a XUV photon. Because of the generating process in itself, this light source is a promising candidate to probe the electronic structure of atoms and molecules, with an attosecond/sub-nanometer potential resolution (1 as=10-18 s).In this work, we have studied the sensitivity of the emitted light (in terms of amplitude, but also phase and polarization) towards the electronic structure of the generating medium. We have first worked on atomic medium, then on molecules (N2, CO2, O2). Comparing the experimental results with numerical simulations shows the necessity to model finely the generation process and to go beyond commonly used approximations.We have also shown the possibility to perform high harmonic spectroscopy in order to measure dynamics of complex molecules, such as Nitrogen Dioxide (NO2). This technic has obtained complementary results compared to classical spectroscopy and has revealed dynamics of the electronic wavepacket along a conical intersection. In this experiment, we have adapted conventionnal optical spectroscopy technics to the XUV spectral area, which significantly improved the signal over noise ratio
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Mauger, François. "Double ionisation d' atomes soumis à des impulsions laser intenses : vue de l' espace des phases." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4031.

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Lorsqu'ils sont soumis à des pulses laser courts et intenses, des atomes peuvent perdre des électrons. Plusieurs canaux sont impliqués dans la double ionisation, comme la NSDI et le scénario associé de la recollision. La recollision est maintenant vue comme la “pierre d'angle de la physique en champ fort” pour les éclairages qu'elle donne dans l'organisation de la matière et en ce qu'elle constitue l'une des manifestations les plus flagrantes de la corrélation électron-électron dans la nature. Dans ce manuscrit, une analyse théorique des mécanismes de double ionisation est menée en utilisant la mécanique classique. Cette description complémente les modèles quantiques en observant la dynamique depuis un cadre de travail différent et avec l'éclairage de la dynamique nonlinéaire. L'analyse, menée dans l'espace des phases, permet l'identification des structures organisatrices qui régulent les différents mécanismes d'ionisation. Pour des champs laser polarisés linéairement, le mécanisme de la recollision est complété par l'image de l'électron interne. L'électron interne donne accès à une description fine de la dynamique de recollision et explique les différentes routes pour la double ionisation. Il permet également de faire des prédictions telles que l'intensité du coude dans la probabilité de double ionisation et explique complètement la RESI. En polarisation circulaire, il est communément cru que la recollision n'est pas possible, en dépit de résultats expérimentaux contradictoires. En fait, l'analyse de l'espace des phases montre que la recollision est possible mais pas accessible à tous les atomes, réconciliant par conséquent les contradictions expérimentales précédentes
When subjected to strong and short laser pulses, atoms may lose electrons. Several ionization channels are involved in such double ionization events, like nonsequential double ionization (NSDI) and its associated recollision scenario. Recollision is now seen as the “keystone of strong field physics”, for its insights into the organization of matter, and is one of the most dramatic manifestations of electron-electron correlation in nature. In this manuscript a theoretical analysis of the double ionization mechanisms is carried out using classical mechanics. This description complements quantum treatments by observing the dynamics from a different framework, with the light of nonlinear dynamics, as both frameworks exhibit the main ingredient, i.e., strong electron-electron correlation. The analysis, carried out in phase space (e.g., through reduced models) enables the identification of the organizing structures that regulate the ionization channels. For linearly polarized lasers, the recollision mechanism is completed by the picture of the “inner” electron. The inner electron gives access to a fine description of the recollision dynamics and explains the routes to double ionization. It also enables verifiable predictions such as the location of the characteristic knee shape in the double ionization yield versus laser intensity and fully explains delayed ionizations like RESI. For circular polarization, it is commonly believed that recollision is not possible, despite apparently contradictory experimental results. In fact, the phase space analysis shows that recollision is possible but not accessible to all atoms, thus reconciling the previous experimental results
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Dethlefsen, Mark Georg Bernhard. "Charge transfer processes of atomic hydrogen Rydberg states near surfaces." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:1ef5ece3-43cf-40fc-a1fd-bf7c637e2d23.

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When approaching a metal surface, the electronic structure of Rydberg atoms or molecules is perturbed by the surface potential and at close enough distances resonant ionisation of the Rydberg electron into the conduction band of the surface can occur. It is possible to interfere in this process and steer the ionisation distance by making use of the polarisability of the Rydberg orbital in the presence of electric fields. The resulting ions from the surface can extracted via electric fields and subsequently detected via well established ion detection schemes. The question of how this charge-transfer process is affected by different properties of the surface (both electronic and structural) represents the main aspect of the work presented in this thesis. At first, the charge transfer of atomic hydrogen Rydberg atoms with a flat gold metal surface is investigated. While such a surface might appear homogeneous, stray fields are present in its vicinity due to local variations in the surface work function. The surface ionisation process as a function of applied electric field is therefore measured experimentally and the results are compared with classical Monte-Carlo simulations (which include stray field effects). This way the possibility to utilize Rydberg states as a probe of the magnitude of such stray fields is demonstrated. To investigate the effect the surface structure can have on the ionisation process, the interaction of Rydberg atoms with surfaces covered by nanoparticles is investigated. Surface ionisation is measured at a 5 nm nanoparticle monolayer surface and it is shown that population transfer between surface- and vacuum-oriented Rydberg states occurs. In addition, results are presented, which suggest a dependence of the ionisation process on the relative size of Rydberg orbital and nanoparticle. Furthermore, charge transfer between a Rydberg state and discrete electronic states at the surface vacuum interface are investigated by performing experiments with a Cu(100) band-gap semiconductor surface. By analysing surface ionisation as a function of collisional velocity ionisation rates can be determined and are subsequently compared with theoretical predictions. The potential of identifying resonant ionisation is thereby demonstrated. Last, a new method to produce 2s atomic hydrogen via mixing of the 2s and 2p state in an electric field is proposed and first experimental results are presented, thus demonstrating viability of the idea. The experiments presented in this thesis represent the most in depth analysis of the charge-transfer process between atomic hydrogen Rydberg states and a range of different surfaces to date. As such, they demonstrate the potential of utilizing the unique properties of Rydberg states and their applicability as surface probes. In addition, these results pave the way for further experiments involving thin films or the phenomenon of quantum reflectivity.
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Books on the topic "Laser Molecular Interaction"

1

Lalanne, J. R. Laser molecule interaction: Laser physics and molecular nonlinear optics. New York: Wiley, 1996.

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Scottish Universities Summer School in Physics (60th 2005 St. Andrews, Scotland). Laser-plasma interactions. Edited by Jaroszynski Dino A, Bingham R. A, and Cairns R. A. Boca Raton: Taylor & Francis, 2009.

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A, Jaroszynski Dino, Bingham R. A, and Cairns R. A, eds. Laser-plasma interactions. Boca Raton: Taylor & Francis, 2009.

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Advances of atoms and molecules in strong laser fields. Singapore: World Scientific, 2015.

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Olaf, Hartmann, Marton Johann, Suzuki Ken, Widmann Eberhard, Zmeskal Johann, and SpringerLink (Online service), eds. EXA 2011: Proceedings of the International Conference on Exotic Atoms and Related Topics (EXA 2011) held in Vienna, Austria, September 5-9, 2011. Dordrecht: Springer Netherlands, 2012.

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N, Bloembergen, Rahman N. K, Rizzo A, and Società italiana di fisica, eds. Atoms, molecules and quantum dots in laser fields: Fundamental processes : Pisa, 12-16 June 2000. Bologna: Italian Physical Society, 2001.

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Antonio, Rizzo, Rahman Naseem, and Bloembergen Nicolas, eds. Atoms, molecules and quantum dots in laser fields: Fundamental processes : Pisa, 12- 16 June 2000. Bologna: Italian physical society, 2001.

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Astapenko, Valeriy. Interaction of Ultrashort Electromagnetic Pulses with Matter. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Mittleman, Marvin H. Introduction to the theory of laser-atom interactions. 2nd ed. New York: Plenum Press, 1993.

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Hee, Nam Chang, Janulewicz Karol A, and SpringerLink (Online service), eds. X-Ray Lasers 2010: Proceedings of the 12th International Conference on X-Ray Lasers, 30 May–4 June 2010, Gwangju, Korea. Dordrecht: Springer Netherlands, 2011.

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Book chapters on the topic "Laser Molecular Interaction"

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Apollonov, V. V. "Interaction of CO2 Laser Nanosecond Pulse Train with the Metallic Targets in Optical Breakdown Regime." In High-Energy Molecular Lasers, 367–78. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-33359-5_45.

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Mazur, Eric. "The Interaction of Intense Picosecond Infrared Pulses with Isolated Molecules." In Atomic and Molecular Processes with Short Intense Laser Pulses, 329–36. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0967-3_39.

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Chandran, Divya, Greg Hather, and Mary C. Wildermuth. "Global Expression Profiling of RNA from Laser Microdissected Cells at Fungal–Plant Interaction Sites." In Methods in Molecular Biology, 263–81. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61737-998-7_20.

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Chandran, Divya, Noriko Inada, and Mary C. Wildermuth. "Laser Microdissection of Plant–Fungus Interaction Sites and Isolation of RNA for Downstream Expression Profiling." In Methods in Molecular Biology, 241–62. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61737-998-7_19.

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Bruder, Lukas, Markus Koch, Marcel Mudrich, and Frank Stienkemeier. "Ultrafast Dynamics in Helium Droplets." In Topics in Applied Physics, 447–511. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94896-2_10.

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Abstract Helium nanodroplets are peculiar systems, as condensed superfluid entities on the nanoscale, and as vessels for studies of molecules and molecular aggregates and their quantum properties at very low temperature. For both aspects, the dynamics upon the interaction with light is fundamental for understanding the properties of the systems. In this chapter we focus on time-resolved experiments in order to study ultrafast dynamics in neat as well as doped helium nanodroplets. Recent experimental approaches are reviewed, ranging from time-correlated photon detection to femtosecond pump-probe photoelectron and photoion spectroscopy, coherent multidimensional spectroscopy as well as applications of strong laser fields and novel, extreme ultraviolet light sources. The experiments examined in more detail investigate the dynamics of atomic and molecular dopants, including coherent wave packet dynamics and long-lived vibrational coherences of molecules attached to and immersed inside helium droplets. Furthermore, the dynamics of highly-excited helium droplets including interatomic Coulombic decay and nanoplasma states are discussed. Finally, an outlook concludes on the perspectives of time-resolved experiments with helium droplets, including recent options provided by new radiation sources of femto- or even attosecond laser pulses up to the soft X-ray range.
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Roux, Brice, Nathalie Rodde, Sandra Moreau, Marie-Françoise Jardinaud, and Pascal Gamas. "Laser Capture Micro-Dissection Coupled to RNA Sequencing: A Powerful Approach Applied to the Model Legume Medicago truncatula in Interaction with Sinorhizobium meliloti." In Methods in Molecular Biology, 191–224. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-8657-6_12.

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Benedek, G. "Molecule-Surface Interaction: Vibrational Excitations." In Interfaces Under Laser Irradiation, 27–39. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-1915-5_2.

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Banerjee, Sudeep, G. Ravindra Kumar, and Lokesh C. Tribedi. "Intense, Ultrashort, Laser-Solid Interactions." In Trends in Atomic and Molecular Physics, 1–13. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4259-9_1.

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Hirschfelder, Joseph O. "Where are Laser-Molecule Interactions Headed?" In Advances in Chemical Physics, 1–79. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470141229.ch1.

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Codling, K., and L. J. Frasinski. "Laser — Molecule Interactions at High Intensities." In Atoms in Strong Fields, 513–28. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9334-5_30.

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Conference papers on the topic "Laser Molecular Interaction"

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Walther, Herbert. "Study of Molecule Surface Interaction Dynamics by Laser." In Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/msba.1985.wb5.

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During the last decade atomic and molecular beam techniques have been of great help for investigating the dynamics of atom or molecule-surface interaction. As long as atoms are involved in the interaction process, the measurements of angular and velocity distributions provide sufficient insight. When molecules are scattered, however, additional information on changes of the internal energy is necessary. Recently, the laser-induced fluorescence method and resonance ionization in combination with time-of-flight measurements were successfully used to determine the influence of surface interaction on the energy distribution between translational, rotational, vibrational and electronic excitation (see references [1,2] for a survey on the published work). The laser experiments lead to a complete description of the dynamics of the molecule-surface interaction.
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2

Davidovich, Michael V. "Dispersion interaction of 1D filaments." In Laser Physics, Photonic Technologies, and Molecular Modeling, edited by Vladimir L. Derbov. SPIE, 2022. http://dx.doi.org/10.1117/12.2626294.

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Ma, Lianying, Songqing Zhou, Chao Huang, Hongwei Cheng, and Feng Zhu. "Molecular sieve separation of ground state HF molecules in a non-chain HF laser." In Third International Symposium on Laser Interaction with Matter, edited by Yury M. Andreev, Zunqi Lin, Xiaowu Ni, and Xisheng Ye. SPIE, 2015. http://dx.doi.org/10.1117/12.2183282.

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4

Mödi, A., F. Budde, T. Gritsch, T. J. Chuang, and G. Ertl. "Laser probing of gas-surface interaction dynamics." In Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/msba.1987.wa1.

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Collision of a molecule with a solid surface leads to energy redistribution within its translational as well as internal degrees of freedom. The populations of the various quantum states of the latter may be probed by laser induced fluorescence (LIF) or by multiphoton ionisation (MPI). Combination of these techniques with time-of-flight (TOF) measurements in a molecular beam apparatus allows, in addition, determination of state-selected translational energy distributions.
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Bonch-Bruevich, Alexey M., E. N. Kaliteevskaya, V. P. Krutyakova, and T. K. Razumova. "Radiation action on polymethine dyes prepared on insulating substrates as molecular layers." In Nonresonant Laser-Matter Interaction (NLMI-10), edited by Mikhail N. Libenson. SPIE, 2001. http://dx.doi.org/10.1117/12.431206.

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Ma, Lianying, Songqing Zhou, Huang Chao, Ke Huang, Feng Zhu, Kunpeng Luan, and Hongwei Chen. "Study on molecular sieve absorption of ground state HF molecules in a non-chain pulsed HF Laser." In 4th International Symposium on Laser Interaction with Matter, edited by Yongkun Ding, Guobin Feng, Dieter H. H. Hoffmann, Jianlin Cao, and Yongfeng Lu. SPIE, 2017. http://dx.doi.org/10.1117/12.2268333.

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Fukumura, Hiroshi, Nobuko Mibuka, Hideki Fukumoto, and Hiroshi Masuhara. "Molecular mechanism of porphyrin-sensitized laser ablation of polymeric materials." In Laser interaction and related plasma phenomena: 12th international conference. AIP, 1996. http://dx.doi.org/10.1063/1.50412.

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8

Daun, K. J., M. Karttunen, and J. T. Titantah. "Molecular Dynamics Simulation of Thermal Accommodation Coefficients for Laser-Induced Incandescence Sizing of Nickel Nanoparticles." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64747.

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While time-resolved laser-induced incandescence is most often used to characterize the size and concentration of aerosolized carbonaceous particles, it has recently been applied to aerosols containing metal nanoparticles. This calculation requires the thermal accommodation coefficient, however, which is often difficult to determine experimentally. This paper presents a molecular dynamics investigation of the thermal accommodation coefficient between laser-energized nickel nanoparticles immersed in argon, and the underlying the gas-surface scattering physics. The predicted interaction between gas molecules and the laser-energized surface depends strongly on the potential between the gas molecule and a surface atom: a Lennard-Jones 6–12 potential derived using the Lorentz-Berthelot combination rules overestimates the potential well due to a bond-order effect in the nickel, resulting in strong trapping-desorption and near-perfect thermal accommodation. A Morse potential with parameters obtained directly from ab initio free energies predicts a relatively brief interaction between the gas molecule and nickel surface, on the other hand, and a lower thermal accommodation coefficient similar to experimentally-derived values for laser-energized iron nanoparticles in argon reported in the literature.
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Zakharov, S. D., Mishik A. Kazaryan, and Nikolay P. Korotkov. "Some effects of interaction of laser radiation with small particles." In Second Conference on Pulsed Lasers: Pulsed Atomic and Molecular Transitions, edited by Victor F. Tarasenko, Georgy V. Mayer, and Gueorgii G. Petrash. SPIE, 1995. http://dx.doi.org/10.1117/12.216921.

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Quan, Haiyong, and Zhixiong (James) Guo. "Energy Transfer and Molecule-Radiation Interaction in Optical Microcavities." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14689.

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Laser energy transfer and molecule-radiation interaction in optical microcavity devices are characterized. The device is operated at whispering-gallery modes, and consists of a microcavity and a micro-waveguide coupled by a sub-micrometer air-gap. Emphases are placed on the influences of microcavity size and waveguide compatibility on the energy transfer and storage capability, on the interactions of foreign molecules with the evanescent radiation field surrounding a resonant microcavity. An optimal gap is found for the considered device configuration where maximum energy storage is achieved. This optimal gap is dependent on the resonance mode as well as the morphology. The Q factor increases exponentially with increasing gap and saturates as the gap approaches the optical wavelength. The influence of molecules attachment is demonstrated and the potential in molecular detection is discussed.
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Reports on the topic "Laser Molecular Interaction"

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Guo, Chunlei. Ultrafast Ultraintense Laser-Matter Interactions - From Molecules to Metals. Fort Belvoir, VA: Defense Technical Information Center, October 2011. http://dx.doi.org/10.21236/ada564681.

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Rosenwaks, Salmon. Potential Visible Chemical Lasers via Interactions of Singlet Molecular Oxygen with Heavy Metal Atoms and Oxides. Fort Belvoir, VA: Defense Technical Information Center, November 1985. http://dx.doi.org/10.21236/ada161174.

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McClure, Michael A., Yitzhak Spiegel, David M. Bird, R. Salomon, and R. H. C. Curtis. Functional Analysis of Root-Knot Nematode Surface Coat Proteins to Develop Rational Targets for Plantibodies. United States Department of Agriculture, October 2001. http://dx.doi.org/10.32747/2001.7575284.bard.

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The goal of this research was to provide a better understanding of the interface between root-knot nematodes, Meloidogyne spp., and their host in order to develop rational targets for plantibodies and other novel methods of nematode control directed against the nematode surface coat (SC). Specific objectives were: 1. To produce additional monoclonal SC antibodies for use in Objectives 2, 3, and 4 and as candidates for development of plantibodies. 2. To determine the production and distribution of SC proteins during the infection process. 3. To use biochemical and immunological methods to perturbate the root-knot nematode SC in order to identify SC components that will serve as targets for rationally designed plantibodies. 4. To develop SC-mutant nematodes as additional tools for defining the role of the SC during infection. The external cuticular layer of nematodes is the epicuticle. In many nematodes, it is covered by a fuzzy material termed "surface coat" (SC). Since the SC is the outermost layer, it may playa role in the interaction between the nematode and its surroundings during all life stages in soil and during pathogenesis. The SC is composed mainly of proteins, carbohydrates (which can be part of glycoproteins), and lipids. SC proteins and glycoproteins have been labeled and extracted from preparasitic second-stage juveniles and adult females of Meloidogyne and specific antibodies have been raised against surface antigens. Antibodies can be used to gain more information about surface function and to isolate genes encoding for surface antigens. Characterization of surface antigens and their roles in different life-stages may be an important step towards the development of alternative control. Nevertheless, the role of the plant- parasitic nematode's surface in plant-nematode interaction is still not understood. Carbohydrates or carbohydrate-recognition domains (CROs) on the nematode surface may interact with CROs or carbohydrate molecules, on root surfaces or exudates, or be active after the nematode has penetrated into the root. Surface antigens undoubtedly play an important role in interactions with microorganisms that adhere to the nematodes. Polyclonal (PC) and monoclonal (MC) antibodies raised against Meloidogyne javanica, M. incognita and other plant-parasitic nematodes, were used to characterize the surface coat and secreted-excreted products of M. javanica and M. incognita. Some of the MC and PC antibodies raised against M. incognita showed cross-reactivity with the surface coat of M. javanica. Further characterization, in planta, of the epitopes recognized by the antibodies, showed that they were present in the parasitic juvenile stages and that the surface coat is shed during root penetration by the nematode and its migration between root cells. At the molecular level, we have followed two lines of experimentation. The first has been to identify genes encoding surface coat (SC) molecules, and we have isolated and characterized a small family of mucin genes from M. incognita. Our second approach has been to study host genes that respond to the nematode, and in particular, to the SC. Our previous work has identified a large suite of genes expressed in Lycopersicon esculentum giant cells, including the partial cDNA clone DB#131, which encodes a serine/threonine protein kinase. Isolation and predicted translation of the mature cDNA revealed a frame shift mutation in the translated region of nematode sensitive plants. By using primers homologous to conserved region of DB#131 we have identified the orthologues from three (nematode-resistant) Lycopersicon peruvianum strains and found that these plants lacked the mutation.
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Droby, Samir, Michael Wisniewski, Ron Porat, and Dumitru Macarisin. Role of Reactive Oxygen Species (ROS) in Tritrophic Interactions in Postharvest Biocontrol Systems. United States Department of Agriculture, December 2012. http://dx.doi.org/10.32747/2012.7594390.bard.

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To elucidate the role of ROS in the tri-trophic interactions in postharvest biocontrol systems a detailed molecular and biochemical investigation was undertaken. The application of the yeast biocontrol agent Metschnikowia fructicola, microarray analysis was performed on grapefruit surface wounds using an Affymetrix Citrus GeneChip. the data indicated that 1007 putative unigenes showed significant expression changes following wounding and yeast application relative to wounded controls. The expression of the genes encoding Respiratory burst oxidase (Rbo), mitogen-activated protein kinase (MAPK) and mitogen-activated protein kinase kinase (MAPKK), G-proteins, chitinase (CHI), phenylalanine ammonia-lyase (PAL), chalcone synthase (CHS) and 4-coumarate-CoA ligase (4CL). In contrast, three genes, peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT), were down-regulated in grapefruit peel tissue treated with yeast cells. The yeast antagonists, Metschnikowia fructicola (strain 277) and Candida oleophila (strain 182) generate relatively high levels of super oxide anion (O2−) following its interaction with wounded fruit surface. Using laser scanning confocal microscopy we observed that the application of M. fructicola and C. oleophila into citrus and apple fruit wounds correlated with an increase in H2O2 accumulation in host tissue. The present data, together with our earlier discovery of the importance of H₂O₂ production in the defense response of citrus flavedo to postharvest pathogens, indicate that the yeast-induced oxidative response in fruit exocarp may be associated with the ability of specific yeast species to serve as biocontrol agents for the management of postharvest diseases. Effect of ROS on yeast cells was also studied. Pretreatment of the yeast, Candida oleophila, with 5 mM H₂O₂ for 30 min (sublethal) increased yeast tolerance to subsequent lethal levels of oxidative stress (50 mM H₂O₂), high temperature (40 °C), and low pH (pH 4). Suppression subtractive hybridization analysis was used to identify genes expressed in yeast in response to sublethal oxidative stress. Transcript levels were confirmed using semi quantitative reverse transcription-PCR. Seven antioxidant genes were up regulated. Pretreatment of the yeast antagonist Candida oleophila with glycine betaine (GB) increases oxidative stress tolerance in the microenvironment of apple wounds. ROS production is greater when yeast antagonists used as biocontrol agents are applied in the wounds. Compared to untreated control yeast cells, GB-treated cells recovered from the oxidative stress environment of apple wounds exhibited less accumulation of ROS and lower levels of oxidative damage to cellular proteins and lipids. Additionally, GB-treated yeast exhibited greater biocontrol activity against Penicillium expansum and Botrytis cinerea, and faster growth in wounds of apple fruits compared to untreated yeast. The expression of major antioxidant genes, including peroxisomal catalase, peroxiredoxin TSA1, and glutathione peroxidase was elevated in the yeast by GB treatment. A mild heat shock (HS) pretreatment (30 min at 40 1C) improved the tolerance of M. fructicola to subsequent high temperature (45 1C, 20–30 min) and oxidative stress (0.4 mol-¹) hydrogen peroxide, 20–60 min). HS-treated yeast cells showed less accumulation of reactive oxygen species (ROS) than non-treated cells in response to both stresses. Additionally, HS-treated yeast exhibited significantly greater (P≥0.0001) biocontrol activity against Penicillium expansum and a significantly faster (Po0.0001) growth rate in wounds of apple fruits stored at 25 1C compared with the performance of untreated yeast cells. Transcription of a trehalose-6-phosphate synthase gene (TPS1) was up regulated in response to HS and trehalose content also increased.
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Chefetz, Benny, and Jon Chorover. Sorption and Mobility of Pharmaceutical Compounds in Soils Irrigated with Treated Wastewater. United States Department of Agriculture, 2006. http://dx.doi.org/10.32747/2006.7592117.bard.

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Research into the fate of pharmaceutical compounds (PCs) in the environment has focused on aspects of removal efficiency during sewage treatment, degradation in surface water and accumulation in soils and sediments. However, very little information is available on the binding interactions of pharmaceuticals with dissolved organic matter (DOM) originating from wastewater treatment. Such interactions can significantly affect the transport potential of PCs in soils by altering compound affinity for soil particle surfaces. Our primary hypothesis is that the transport potential of PCs in soils is strongly impacted by the type and strength of interaction with DOM and the stability of resulting DOM-PC complexes. The overarching goal of the proposed work is to develop a better understanding of the risk associated with introduction of PCs into the environment with treated wastewater. This goal has been achieved by elucidating the mechanisms of the interaction of selected pharmaceuticals (that have shown to be widespread wastewater contaminants) with DOM constituents; by determining the stability and fate of DOM-PC complexes introduced to soils and soil constituents; and by evaluating the potential uptake of these compounds by plants. Based on the results obtained in this study (column and batch sorption-desorption experiments), we suggest that PCs can be classified as slow-mobile compounds in SOM-rich soil layers. When these compounds pass this layer and/or are introduced into SOM-poor soils, their mobility increases significantly. Our data suggest that in semiarid soils (consisting of low SOM), PCs can potentially be transported to the groundwater in fields irrigated with reclaimed wastewater. Moreover, the higher mobility of the acid PCs (i.e., naproxen and diclofenac) in freshwater column systems suggests that their residues in soils irrigated with reclaimed wastewater can leach from the root zone and be transported to the groundwater after rain events. Our data obtained from the binding experiments of PCs with DOM demonstrate that the hydrophobic DOM fractions were more efficient at sorbing PCs than the more polar hydrophilic fractions at a pH near the pKa of the analytes. At the pH of natural semiarid water and soil systems, including that of reclaimed wastewater and biosolids, the role of the hydrophobic fractions as sorption domains is less important than the contribution of the hydrophilic fractions. We also hypothesize that the DOM fractions interact with each other at the molecular level and do not act as independent sorption domains. In summary, our data collected in the BARD project demonstrate that the sorption abilities of the DOM fractions can also significantly affect the mobility of pharmaceutical compounds in soils influenced by intensive irrigation with treated wastewater or amended with biosolids.
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Chefetz, Benny, and Jon Chorover. Sorption and Mobility of Pharmaceutical Compounds in Soils Irrigated with Treated Wastewater. United States Department of Agriculture, 2006. http://dx.doi.org/10.32747/2006.7709883.bard.

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Research into the fate of pharmaceutical compounds (PCs) in the environment has focused on aspects of removal efficiency during sewage treatment, degradation in surface water and accumulation in soils and sediments. However, very little information is available on the binding interactions of pharmaceuticals with dissolved organic matter (DOM) originating from wastewater treatment. Such interactions can significantly affect the transport potential of PCs in soils by altering compound affinity for soil particle surfaces. Our primary hypothesis is that the transport potential of PCs in soils is strongly impacted by the type and strength of interaction with DOM and the stability of resulting DOM-PC complexes. The overarching goal of the proposed work is to develop a better understanding of the risk associated with introduction of PCs into the environment with treated wastewater. This goal has been achieved by elucidating the mechanisms of the interaction of selected pharmaceuticals (that have shown to be widespread wastewater contaminants) with DOM constituents; by determining the stability and fate of DOM-PC complexes introduced to soils and soil constituents; and by evaluating the potential uptake of these compounds by plants. Based on the results obtained in this study (column and batch sorption-desorption experiments), we suggest that PCs can be classified as slow-mobile compounds in SOM-rich soil layers. When these compounds pass this layer and/or are introduced into SOM-poor soils, their mobility increases significantly. Our data suggest that in semiarid soils (consisting of low SOM), PCs can potentially be transported to the groundwater in fields irrigated with reclaimed wastewater. Moreover, the higher mobility of the acid PCs (i.e., naproxen and diclofenac) in freshwater column systems suggests that their residues in soils irrigated with reclaimed wastewater can leach from the root zone and be transported to the groundwater after rain events. Our data obtained from the binding experiments of PCs with DOM demonstrate that the hydrophobic DOM fractions were more efficient at sorbing PCs than the more polar hydrophilic fractions at a pH near the pKa of the analytes. At the pH of natural semiarid water and soil systems, including that of reclaimed wastewater and biosolids, the role of the hydrophobic fractions as sorption domains is less important than the contribution of the hydrophilic fractions. We also hypothesize that the DOM fractions interact with each other at the molecular level and do not act as independent sorption domains. In summary, our data collected in the BARD project demonstrate that the sorption abilities of the DOM fractions can also significantly affect the mobility of pharmaceutical compounds in soils influenced by intensive irrigation with treated wastewater or amended with biosolids.
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