Thematische Bibliographien / Interaction Laser-Molecules

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  2. Dissertationen
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  4. Buchteile
  5. Konferenzberichte
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Auswahl der wissenschaftlichen Literatur zum Thema „Interaction Laser-Molecules“

Autor: Grafiati
Veröffentlicht am 1. Februar 2025

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Zeitschriftenartikel zum Thema "Interaction Laser-Molecules"

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Oreshkin, A. I., D. A. Muzychenko, S. I. Oreshkin, V. I. Panov, V. O. Surov, N. S. Maslova und M. N. Petukhov. „Quantum traps for coupling of fluorofullerene molecules“. Laser Physics Letters 20, Nr. 1 (01.12.2022): 015202. http://dx.doi.org/10.1088/1612-202x/aca4ce.

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Abstract The interaction of fluorine atoms with Cu(111) surface has been analyzed by means of scanning tunneling microscopy and x-ray photoelectron spectroscopy (XPS). A submonolayer coverage of fluorinated fullerene C60F18 has been chosen to provide a well controllable arrival of fluorine atoms on copper surface. The appearance of F-induced surface structures on the Cu(111) surface caused by defluorination of C60F18 molecules adsorbed on the surface was shown. XPS measurements unambiguously indicate the existence of chemical state of fluorine not typical for CuF2 formation. Superstructure of well ordered metastable clusters consisting of fluorofullerene molecules are formed on the Cu(111) surface as a result of the balance of two interactions: the dipole-dipole interaction between fluorofullerene molecules and the interaction of C60F18 molecules with the two-dimensional gas phase, emerging above the copper surface. Regular surface structure formed by fullerene molecules interacting through collective vibrational mode can be used for entanglement formation between two qubits each associated with ground and excited electronic states of the molecule by applying two coherent laser pulses.
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Bauer, Dieter. „Molecules and Clusters in Intense Laser Fields“. Laser and Particle Beams 20, Nr. 3 (Juli 2002): 541–42. http://dx.doi.org/10.1017/s0263034602002318.

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The interaction of intense laser light with molecules and clusters is a rapidly evolving research area. Its attraction lies in both the underlying fundamental physics and the prospects for applications. The interaction of intense laser light with rare-gas clusters, for instance, leads to megaelectron volt electrons, multikiloelectron volt ions, and bright X-ray emission. In laser-irradiated D2 clusters, thermonuclear fusion has been achieved.
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Yang, Jinghui, Cuiying Huang und Xinping Zhang. „Femtosecond Optical Annealing Induced Polymer Melting and Formation of Solid Droplets“. Polymers 11, Nr. 1 (13.01.2019): 128. http://dx.doi.org/10.3390/polym11010128.

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Interaction between femtosecond laser pulses with polymeric thin films induced transient optical annealing of the polymer molecules. Melting of the polymer films took place during the transient annealing process, so that a solid-liquid-solid phase transition process was observed. Ultrafast cooling of the melting polymer produced solidified droplets. Microscopic and spectroscopic characterization revealed that the polymer molecules were rearranged with preferable H-aggregation to reach the lowest formation energy during the melting process. Intermolecular coupling was enhanced due to the modified molecular arrangement. This observation of melting of polymeric semiconductors due to the interaction with femtosecond light pulses is potentially important for better understanding laser-matter interactions and for exploring organic optoelectronic devices through special material processing.
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Ponomarev, Yu N., und S. R. Uogintas. „Nonresonant interaction of femtosecond laser pulse with centrosymmetric molecules“. Optics Communications 283, Nr. 4 (Februar 2010): 591–94. http://dx.doi.org/10.1016/j.optcom.2009.10.090.

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Zhang, Bin, und Zengxiu Zhao. „SLIMP: Strong laser interaction model package for atoms and molecules“. Computer Physics Communications 192 (Juli 2015): 330–41. http://dx.doi.org/10.1016/j.cpc.2015.02.031.

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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 und 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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E. Prieto, L. X. Hallado, A. Guerrero, I. Álvarez und C. Cisneros. „Effect of Laser Radiation on Biomolecules“. Journal of Nuclear Physics, Material Sciences, Radiation and Applications 7, Nr. 2 (28.02.2020): 123–28. http://dx.doi.org/10.15415/jnp.2020.72015.

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Time of flight laser photoionization has been used to study the response of some molecules of biological interest under laser radiation. One of the questions of great interest today is the effect of radiation on DNA and RNA molecules. Damage to these molecules can be caused directly by radiation or indirectly by secondary electrons created by radiation. As response of the radiation field fragmentation process can occur producing different ions with kinetic energies of a few electron volts. In this paper we present the results of the interaction of 355nm laser with the nitrogen bases adenine(A) and uracil(U) using time-of-flight spectrometry and the comparison of experimental results on the effects of laser radiation in (A) and (U) belonging to two different ring groups, purines and pyrimidines respectively,which are linked to form the AU pair of the RNA.
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Shirakawa, Masayuki, Takayoshi Kobayashi und Eiji Tokunaga. „Solvent Effects in Highly Efficient Light-Induced Molecular Aggregation“. Applied Sciences 9, Nr. 24 (09.12.2019): 5381. http://dx.doi.org/10.3390/app9245381.

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It has been reported that when irradiated with laser light non-resonant with the main absorption peaks, porphyrin molecules (4-[10,15,20-tris(4-sulfophenyl)-21,24-dihydroporphyrin-5-yl]benzenesulfonic acid, TPPS) in an aqueous solution become 10,000 to 100,000 times more efficient in light-induced molecular aggregation than expected from the ratio of gradient force potential to the thermal energy of molecules at room temperature. To determine the mechanism of this phenomenon, experiments on the light-induced aggregation of TPPS in alcohol solutions (methanol, ethanol, and butanol) were performed. In these alcohol solutions, the absorbance change was orders of magnitude smaller than in the aqueous solution. Furthermore, it was found that the absorbance change in the aqueous solution tended to be saturated with the increase of the irradiation intensity, but in the ethanol solution, the absorbance change increased linearly. These results can be qualitatively explained by the model in which intermolecular light-induced interactions between molecules within a close distance among randomly distributed molecules in the laser irradiation volume are highly relevant to the signal intensity. However, conventional dipole–dipole interactions, such as the Keesom interaction, are not quantitatively consistent with the results.
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Muraviev, Dmitri, Natalya V. Drozdova, Nina B. Dolgina und Aleksandr A. Karabutov. „Potentiometric and Laser-Acoustic Study of Aminecarboxylate Interaction of Amino Acid Molecules“. Langmuir 14, Nr. 7 (März 1998): 1822–28. http://dx.doi.org/10.1021/la971145v.

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Bedurke, Florian, Tillmann Klamroth und Peter Saalfrank. „Many-electron dynamics in laser-driven molecules: wavefunction theory vs. density functional theory“. Physical Chemistry Chemical Physics 23, Nr. 24 (2021): 13544–60. http://dx.doi.org/10.1039/d1cp01100f.

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Molecules excited by laser pulses give rise to High Harmonic Generation and other responses. These are computed here with time-dependent configuration interaction and density functional theories, two popular many-electron methods.
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Dissertationen zum Thema "Interaction Laser-Molecules"

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Heesel, Eva Maria. „Interaction of small molecules with short intense laser pulses“. Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413626.

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Hay, Nick. „The interaction of organic molecules and atomic clusters with ultrashort high intensity laser pulses“. Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312007.

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Talebpour, Abdossamad. „New advances in the interaction of a femtosecond Ti, sapphire laser with atoms and molecules“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0022/NQ36328.pdf.

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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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Karam, Charbel. „Optical shielding of collisions between ultracold polar molecules“. Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP137.

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Ce travail s'inscrit dans le contexte des recherches sur les gaz quantiques de molécules ultra-froides. Ce domaine en pleine expansion place ce type de système comme plate-forme prometteuse pour le contrôle de gaz quantiques pour des applications comme la simulation quantique ou la chimie ultra-froide.Lorsque ces molécules sont préparées dans leur état fondamental absolu et piégées, les observations révèlent la fuite rapide des molécules du piège par des processus collisionnels encore mal compris, empêchant toute application. Une solution consiste à exposer ces molécules à un champ électromagnétique pour supprimer ces pertes, en écrantant les collisions entre molécules. L'écrantage consiste à transformer les interactions attractives en interactions répulsives.Dans cette thèse, je propose une nouvelle technique d'écrantage des collisions basée sur un processus à deux photons dans le domaine optique. La principale motivation pour cette méthode est de combiner les avantages des techniques existantes dans le domaine microonde, tout en éliminant leurs limitations.Je commence par explorer et modéliser les interactions à longue portée entre les molécules polaires, dominées par l'interaction dipôle-dipôle. Je présente mes calculs des courbes d'énergie potentielle d'interaction à longue portée entre deux molécules dans leur état électronique fondamental ainsi que dans des états électroniques excités. Ce calcul, effectué dans la base couplée des moments angulaires dans le référentiel du laboratoire, a permis d'identifier des configurations où l'interaction entre les molécules est répulsive.Il convient donc de coupler l'état initial attractif des molécules en collision, à cet état répulsif. J'ai modélisé l'interaction entre deux molécules dans un schéma de type Raman à deux photons. A l'infini, les molécules individuelles sont placées dans les conditions de la transparence électromagnétiquement induite (EIT), pour les protéger de la diffusion de photons, qui contribue au réchauffement du gaz quantique.Lorsque les molécules interagissent, j'ai montré que leur exposition aux deux photons se modélise au travers d'un schéma à 5 niveaux, chacun d'entre eux étant composé de multiples composantes. Cela impose la prise en compte de cette complexité intrinsèque pour une représentation fidèle du comportement des molécules, s'éloignant ainsi des modèles connus à petit nombre de niveaux. Les fréquences de Rabi et le décalage en fréquence des deux lasers permettent de contrôler l'évolution de la collision entre molécules. En appliquant la théorie de la diffusion indépendante du temps, j'ai propagé la fonction d'onde des deux molécules, dont l'interaction est décrite par les courbes de potentiel habillées par la lumière, en considérant un formalisme purement quantique. J'ai calculé les taux de collisions élastiques, inélastiques et réactives induites par les lasers. L'objectif a été de déterminer les conditions pour lesquelles le taux de collisions élastiques domine les taux de collisions inélastiques et réactives, traduisant les pertes observées. Pour des valeurs de fréquence de Rabi et de décalage en fréquence compatibles avec les conditions expérimentales typiques, le taux de collisions élastiques demeure inférieur aux autres taux, ce qui empêche un écrantage efficace, tout en démontrant l'influence réelle des lasers. La principale raison de cette efficacité limitée est que le schéma proposé repose sur des interactions dipôle-dipôle du 2ème ordre, qui ne sont pas suffisamment fortes pour induire des couplages assez intenses pour protéger les molécules des pertes.Pour y remédier, nous proposons d'utiliser un faible champ électrique statique, qui pourrait coupler des états au 1er ordre, induisant des interactions dipôle-dipôle plus fortes et donc un écrantage plus efficace. Un tel champ est nécessaire dans les futures expériences visant à étudier les effets anisotropes dans les gaz quantiques moléculaires ultra-froids
This work is part of the ongoing research into quantum gases of ultracold molecules. This rapidly expanding field positions these systems as promising platforms for the complete control of quantum gases for applications such as quantum simulation or ultracold chemistry.When these molecules are prepared in their absolute ground state and trapped, observations reveal the rapid escape of molecules from the trap due to collision processes that are still not fully understood, preventing any applications. One solution is to expose these molecules to an electromagnetic field to suppress these losses by "shielding" collisions between molecules. Shielding involves transforming attractive interactions into repulsive ones.In this thesis, I propose a new technique for collision shielding based on a two-photon process in the optical domain. The main motivation for this method is to combine the advantages of existing techniques in the microwave domain while eliminating their limitations.I begin by exploring and modeling long-range interactions between polar molecules, dominated by dipole-dipole interactions. I present my calculations of the potential energy curves of long-range interactions between two molecules in their electronic ground state as well as in electronically excited states. This calculation, carried out in the coupled angular momentum basis in the laboratory frame, allowed me to identify configurations where the interaction between the molecules is repulsive.Thus, it is necessary to couple the attractive initial state of the colliding molecules to this repulsive state. I modeled the interaction between two molecules in a two-photon Raman-type scheme within the dipole approximation. At infinity, the individual molecules are placed in conditions of electromagnetically induced transparency (EIT), to protect them from photon scattering, which contributes to the heating of the quantum gas.When the molecules interact, I showed that their exposure to the two photons is modeled through a 5-level scheme, each of which is composed of multiple components. This imposes the need to consider this intrinsic complexity for a faithful representation of the molecules' behavior, departing from known small-level models. The Rabi frequencies and the detuning of the two lasers allow control over the evolution of the collision between molecules.By applying time-independent scattering theory, I propagated the wave function of the two molecules, whose interaction is described by the light-dressed potential curves, using a purely quantum formalism. I calculated the elastic, inelastic, and reactive collision rates induced by the lasers.My goal was to determine the conditions under which the elastic collision rate dominates the inelastic and reactive collision rates, which account for the observed losses. For Rabi frequency and detuning values compatible with typical experimental conditions, the elastic collision rate remains lower than the other rates, preventing effective shielding, though still demonstrating the real influence of the lasers. The main reason for this limited effectiveness is that the proposed scheme relies on second-order dipole-dipole interactions, which are not strong enough to induce sufficiently intense couplings to protect the molecules from losses.To address this issue, we propose using a weak static electric field, which could couple states at the first order, inducing stronger dipole-dipole interactions and thereby more effective shielding. Such a field is necessary for future experiments aiming to study anisotropic effects in quantum gases of ultracold molecules
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Viteau, Matthieu. „Pompage optique et refroidissement laser de la vibration de molecules froides“. Phd thesis, Université Paris Sud - Paris XI, 2008. http://tel.archives-ouvertes.fr/tel-00367369.

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Cette thèse présente différentes études sur la formation et la détection de molécules froides. Différents états moléculaires de grandes élongations, pour la molécule Cs2, sont étudié par spectroscopie de photoassociation et d'ionisation. Ces différentes études ont permis d'affiner notre compréhension des mécanismes de photoassociation d'atomes froids formant des molécules dans l'état fondamental triplet (a 3Σu+).
Une détection non sélective a été développée, pour la recherche de mécanismes de formation de molécules froides dans l'état fondamental singulet avec peu de vibration. Avec cette nouvelle détection, un nouveau mécanisme de formation de molécules par photoassociation d'atomes froids de césium a été trouvé. Celui-ci permet de former efficacement des molécules dans une distribution de niveaux avec très peu de vibration dans l'état fondamental (X 1Σg+).
En utilisant un laser femtoseconde (large spectralement) façonné, un refroidissement vibrationnel des molécules a été démontré, permettant la formation de molécules froides sans vibrations. Le laser femtoseconde, permet d'exciter les nombreux niveaux vibrationnels, créés par photoassociation, il réalise ainsi un pompage optique des molécules. Le laser est façonné de manière à rendre l'état de vibration zéro, noir pour ce laser, et ainsi accumuler toutes les molécules vers ce seul état.
Ce résultat est également simulé par un model théorique simple. Cette simulation permet de généraliser l'idée au refroidissement de la rotation des molécules.

Une partie (résumée) présente, en s'appuyant sur les différents articles publiés, les études sur les interactions dipôle-dipôle, à grandes portées, entre atomes de Rydberg.
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Tong, Xin. „Non-covalent interactions in aromatic molecules and clusters : studies by laser spectroscopy“. Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423680.

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Labeye, Marie. „Molecules interacting with short and intense laser pulses : simulations of correlated ultrafast dynamics“. Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS193/document.

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Cette thèse porte sur différents aspects des dynamiques ultra-rapides d’atomes et de molécules soumises à des impulsions laser infrarouges courtes et intenses. Nous étudions des processus fortement non linéaires tels que l’ionisation tunnel, la génération d’harmoniques d’ordre élevé ou l’ionisation au-dessus du seuil. Deux approches différentes sont utilisées. D’un côté nous mettons au point des modèles analytiques approchés qui nous permettent de construire des interprétations physiques de ces processus. D’autre part nous appuyons les interprétations données par ces modèles avec les résultats obtenus par des simulations numériques qui résolvent explicitement l’équation de Schrödinger dépendante du temps en dimension réduite. Nous étudions également une méthode numérique basée sur l’interaction de configuration dépendante du temps afin de pouvoir des décrire des systèmes à plusieurs électrons plus gros et plus complexes
In this thesis we study different aspects of the ultrafast dynamics of atoms and molecules triggered by intense and short infrared laser pulses. Highly non-linear processes like tunnel ionization, high order harmonic generation and above threshold ionization are investigated. Two different and complementary approaches are used. On the one hand we construct approximate analytical models to get physical insight on these processes. On the other hand, these models are supported by the results of accurate numerical simulations that explicitly solve the time dependent Schrödinger equation for simple benchmark models in reduced dimensions. A numerical method based on time dependent configuration interaction is investigated to describe larger and more more complex systems with several electrons
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Boutu, Willem. „DYNAMIQUE DE LA GENERATION D'HARMONIQUES DANS LES ATOMES ET LES MOLECULES“. Phd thesis, Université Paris Sud - Paris XI, 2007. http://tel.archives-ouvertes.fr/tel-00593728.

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La génération d'harmoniques d'ordre élevé par focalisation d'impulsions laser femtosecondes et intenses dans des gaz permet d'obtenir des trains d'impulsions attosecondes dans l'XUV. Dans cette thèse, nous présentons une technique destinée à optimiser l'efficacité de génération, puis nous montrons comment la caractérisation du rayonnement permet l'étude de la dynamique des molécules en champ fort. Dans une première partie, par une manipulation de sa phase spatiale, nous transformons le profil du faisceau laser infrarouge au foyer afin d'agrandir le volume de génération. Nous mettons en évidence la possibilité de créer un profil carré, élargi d'un facteur 2.5 par rapport au profil gaussien. Nous étudions ensuite la génération d'harmoniques dans les gaz rares par un tel faisceau, à la fois expérimentalement et numériquement. Bien que nous n'ayons pu observer d'augmentation significative du signal harmonique, les simulations effectuées à plus forte énergie indiquent un gain d'efficacité. Dans une seconde partie, nous montrons que le spectre et la phase spectrale du rayonnement harmonique issu d'un ensemble de molécules linéaires alignées présentent des structures liées aux caractéristiques des molécules. Nous mettons en évidence la présence d'un saut de phase lié à un phénomène d'interférences quantiques lors de l'étape de recombinaison. Nous étudions la dépendance de ce saut de phase en fonction de différents paramètres, tels que l'orientation des molécules ou l'éclairement de génération. Ces mesures permettent l'étude de la dynamique électronique lors de la recombinaison du paquet d'ondes électroniques. De plus, elles devront servir de support pour les nouvelles modélisations du comportement des molécules en champ intense.
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Zhang, Bo. „Experimental Studies of Quantum Dynamics and Coherent Control in Homonuclear Alkali Diatomic Molecules“. Doctoral thesis, KTH, Physics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3420.

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The main theme covered in this thesis is experimentalstudies of quantum dynamics and coherent control in homonuclearalkali diatomic molecules by ultrafast laser spectroscopy iththe implementation of pump-probe techniques.

A series of experiments have been performed on the Rb2molecules in a molecular beam as well as in a thermal oven. Thereal-time molecular quantum dynamics of the predissociatingelectronically excited D(3)1Πu state of Rb2, which couples to/intersects several otherneighbouring states, is investigated using wavepackets. Thepredissociation of the D state, explored by this wavepacketmethod, arises from two independent states, the (4)3Σu+and (1)3∆u, for which the second corresponds to a much fasterdecay channel above a sharp energy threshold around 430 nm. Thelifetime of the D state above the energy threshold is obtained,τ ≈ 5 ps, by measuring the decay time of thewavepacket in a thermal oven. Further experimentalinvestigation performed in a molecular beam together withquantum calculations of wavepacket dynamics on the D state haveexplored new probe channels of wavepacket evolution: theD′(3)1Σu+ channel, which exhibits vibrational motionin a shelf state and the (4)3Σu+ channel, where direct build-up of thewavefunction is observed due to its spin-orbit oupling to the Dstate.

The real-time quantum dynamics of wavepackets confined totwo bound states, A1Σu+(0u+) and b3Πu(0u+), have been studied by experiment andcalculations. It is shown that these two states are fullycoupled by spin-orbit interaction, characterised by itsintermediate strength. The intermediate character of thedynamics is established by complicated wavepacket oscillationatterns and a value of 75 cm-1is estimated for the coupling strength at thestate crossing.

The experiments on the Li2molecule are performed by coherent control ofrovibrational molecular wavepackets. First, the Deutsch-Jozsaalgorithm is experimentally demonstrated for three-qubitfunctions using a pure coherent superposition of Li2rovibrational eigenstates. The function’scharacter, either constant or balanced, is evaluated by firstimprinting the function, using a phase-tailored femtosecond(fs) pulse, on a coherent superposition of the molecularstates, and then projecting the superposition onto an ionicfinal state using a second fs pulse at a specific delay time.Furthermore, an amplitude-tailored fs pulse is used to exciteselected rovibrational eigenstates and collision induceddephasing of the wavepacket signal, due to Li2-Ar collisions, is studied experimentally. Theintensities of quantum beats decaying with the delay time aremeasured under various pressures and the collisional crosssections are calculated for each well-defined rovibrationalquantum beat, which set the upper limitsfor ure dephasingcross sections.

Keywords:Ultrafast laser spectroscopy, pump-probetechnique, predissociation, wavepacket, pin-orbit interaction,coherent control, (pure) dephasing

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Bücher zum Thema "Interaction Laser-Molecules"

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

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Dave, Riley, und SpringerLink (Online service), Hrsg. X-Ray Lasers 2008. Dordrecht: Springer Netherlands, 2009.

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Majumdar, Jyotsna Dutta. Laser-Assisted Fabrication of Materials. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Stanislav, Adamenko, Selleri Franco und Van der Merwe Alwyn, Hrsg. Controlled nucleosynthesis: Breakthroughs in experiment and theory. Dorcrecht, The Netherlands: Springer, 2007.

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Melrose, Donald. Quantum Plasmadynamics: Magnetized Plasmas. New York, NY: Springer New York, 2013.

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J, Keyser, Pierrard V und SpringerLink (Online service), Hrsg. The Earth’s Plasmasphere: A CLUSTER and IMAGE Perspective. New York, NY: Springer New York, 2009.

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service), SpringerLink (Online, Hrsg. Large-Scale Perturbations of Magnetohydrodynamic Regimes: Linear and Weakly Nonlinear Stability Theory. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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

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N, Bloembergen, Rahman N. K, Rizzo A und Società italiana di fisica, Hrsg. 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. Springer, 2013.

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Buchteile zum Thema "Interaction Laser-Molecules"

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Randazzo, Juan M., Carlos Marante, Siddhartha Chattopadhyay, Heman Gharibnejad, Barry I. Schneider, Jeppe Olsen und Luca Argenti. „ASTRA, A Transition Density Matrix Approach to the Interaction of Attosecond Radiation with Atoms and Molecules“. In Springer Proceedings in Physics, 115–27. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-47938-0_11.

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AbstractA new formalism and computer code, ASTRA (AttoSecond TRAnsitions), has been developed to treat the interactions of short, intense radiation with molecules. The formalism makes extensive use of transition density matrices, computed using a state-of-the-art quantum chemistry code (LUCIA), to efficiently calculate the many-body inter-channel-coupling interactions required to simulate the highly correlated electron dynamics due to atoms and molecules exposed to attosecond laser radiation.
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Bruder, Lukas, Markus Koch, Marcel Mudrich und 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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Khetselius, Olga Yu, Alexander V. Glushkov, Sergiy M. Stepanenko, Andrey A. Svinarenko und Vasily V. Buyadzhi. „Advanced Quantum-Kinetic Model of Energy Exchange in Atmospheric Molecules Mixtures and CO2 Laser-Molecule Interaction“. In Advances in Methods and Applications of Quantum Systems in Chemistry, Physics, and Biology, 207–16. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68314-6_10.

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Menzel, E. Roland. „Interaction of Light with Molecules—An Overview“. In Laser Spectroscopy, 5–43. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003573951-2.

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von der Linde, D. „Laser-Plasma Interaction in the Femtosecond Time Regime“. In Photon and Electron Collisions with Atoms and Molecules, 279–95. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5917-7_19.

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Chen, Ce, Yi-Yian Yin, A. V. Smith und D. S. Elliott. „Interfering Optical Interactions: Phase Sensitive Absorption“. In Coherence Phenomena in Atoms and Molecules in Laser Fields, 241–54. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3364-1_23.

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Lambropoulos, P., Jian Zhang und X. Tang. „Coherent Interactions within the Atomic Continuum“. In Coherence Phenomena in Atoms and Molecules in Laser Fields, 255–68. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3364-1_24.

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Hüttmann, Gereon. „Interaction of Pulsed Light with Molecules: Photochemical and Photophysical Effects“. In Laser Imaging and Manipulation in Cell Biology, 49–69. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527632053.ch3.

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Midorikawa, Katsumi. „Nonlinear Interaction of Strong XUV Fields with Atoms and Molecules“. In Lectures on Ultrafast Intense Laser Science 1, 175–201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-95944-1_6.

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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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Konferenzberichte zum Thema "Interaction Laser-Molecules"

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Sulimany, Kfir, Offek Tziperman, Yaron Bromberg und Omri Gat. „Casimir-like laser pulse interaction: Molecules and soliton rain“. In Nonlinear Photonics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/np.2022.npth1g.2.

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Soliton in multipulse laser waveforms interact by suppression of quasi-cw fluctuations. Experiments in graphene-based and nonlinear-multimode-interference-based fiber lasers and theoretical analysis demonstrate the interactions manifest with stagnation points, accelerating trajectories, collisions, soliton molecules and phase locking transitions.
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Lademann, Juergen, und Hans-Juergen Weigmann. „Laser spectroscopic detection of molecules and radicals during laser-tissue interaction in laser plumes“. In Europto Biomedical Optics '93, herausgegeben von Martin J. C. van Gemert, Rudolf W. Steiner, Lars O. Svaasand und Hansjoerg Albrecht. SPIE, 1994. http://dx.doi.org/10.1117/12.168049.

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Bandrauk, Andre D., Gennady K. Paramonov, Andrea Gamucci, Antonio Giulietti und Luca Labate. „Laser Induced Nuclear Fusion, LINF, In Muonic Molecules With Ultrashort Super Intense Laser Fields“. In THE 2ND INTERNATIONAL CONFERENCE ON ULTRA-INTENSE LASER INTERACTION SCIENCE. AIP, 2010. http://dx.doi.org/10.1063/1.3326326.

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Schröder, H., B. Rager und K. L. Kompa. „Surface Interaction of Electronically Excited Molecules“. In Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/msba.1987.mb5.

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We have experimentally studied the survival probability of electronically excited molecules in collisions with solid surfaces. The molecular beam was produced by a pulsed nozzle. A fast ion gauge, a QMS, a pyroelectric foil (bolometer) and special light collecting optics were utilized as diagnostic tools. The QMS and the light detector could be rotated around the scattering center, thus allowing for angularly resolved measurements. Scattering from the foil directly revealed the free energy change involved in the scattering process. The molecules tested were Ni(CO)4 and SO2. XeCl laser (308 nm) excitation of Ni(CO)4 yields the electronically excited fragment Ni ( CO ) 3 * with unit efficiency. The radiative lifetime of Ni ( CO ) 3 * is =17μs, that of SO2 is > 55 μs for XeCl laser excitation. A long lifetime is essential for the experimental purpose because the excited portion of the beam must be monitored over a sufficiently long distance in front of and behind the scattering centre.
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Ma, Lianying, Songqing Zhou, Chao Huang, Hongwei Cheng und 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, herausgegeben von Yury M. Andreev, Zunqi Lin, Xiaowu Ni und Xisheng Ye. SPIE, 2015. http://dx.doi.org/10.1117/12.2183282.

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Lan, Pengfei, und Peixiang Lu. „Access to the ultrafast dynamics of molecules-laser interaction with high harmonic spectroscopy“. In High-Power Lasers and Applications IX, herausgegeben von Ruxin Li und Upendra N. Singh. SPIE, 2018. http://dx.doi.org/10.1117/12.2502276.

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Ma, Lianying, Songqing Zhou, Huang Chao, Ke Huang, Feng Zhu, Kunpeng Luan und 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, herausgegeben von Yongkun Ding, Guobin Feng, Dieter H. H. Hoffmann, Jianlin Cao und Yongfeng Lu. SPIE, 2017. http://dx.doi.org/10.1117/12.2268333.

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Endo, Tomoyuki, Karl Michael Ziems, Martin Richter, Friedrich G. Froebel, Akiyoshi Hishikawa, Stefanie Gräfe, François Légaré und Heide Ibrahim. „Post-Ionization Interaction of OCS in Phase-Locked Two-Color Laser Fields“. In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/up.2022.tu4a.55.

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Using phase-locked two-color laser fields, control of fragment ejection direction and selective bond scission of OCS are demonstrated. Post-ionization interaction plays an important role in the dissociation of polar molecules.
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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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Kung, C.-Y., M. D. Barnes, N. Lermer, W. B. Whitten und J. M. Ramsey. „Confinement, Detection, and Manipulation of Individual Molecules in Attoliter Volumes“. In Laser Applications to Chemical and Environmental Analysis. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/lacea.1998.lma.4.

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We report observation of fluorescence from individual rhodamine 6G molecules in streams of charged 1-μm diameter water droplets. With this approach, probe volumes comparable to diffraction-limited fluorescence microscopy1 techniques (≤ 500 attoliters) are achieved, resulting in similarly high contrast between single molecule fluorescence signals and nonfluorescent background. However, since the fluorescent molecules are confined to electrically charged droplets, in situ electrodynamic manipulation can be accomplished in a straightforward manner, allowing experimental control over both the delivery of molecules of interest to the observation region and the laser-molecule interaction time.
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Berichte der Organisationen zum Thema "Interaction Laser-Molecules"

1

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

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