Relevant bibliographies by topics / Photo-Dynamics

Academic literature on the topic 'Photo-Dynamics'

Author: Grafiati
Published: 22 June 2024

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Contents

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

Journal articles on the topic "Photo-Dynamics":

1

KRASILNIKOV, MIKHAIL. "BEAM DYNAMICS OPTIMIZATION FOR THE XFEL PHOTO INJECTOR." International Journal of Modern Physics A 24, no. 05 (February 20, 2009): 879–92. http://dx.doi.org/10.1142/s0217751x0904436x.

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The main challenge for the European XFEL photo injector is the production of 1 nC electron beams with a normalized transverse emittance of 0.9 mm mrad. The photo injector setup consists of a 1.5-cell L-band rf gun cavity supplied with solenoids for beam focusing and emittance compensation and the first accelerating section with 8 TESLA superconducting cavities. The first 4 cavities are used as a booster to provide by proper choice of its position, gradient and phase matching conditions for the emittance conservation. For optimization of the beam dynamics in the photo injector, a staged algorithm, based on ASTRA simulations, has been developed. The first stage considers the emission of electrons from a photo cathode. The cathode laser energy and its transverse parameters are adjusted to produce a bunch charge of 1 nC in presence of space charge forces (including image charge at the cathode) and Schottky-like effects. The second stage contains rf gun cavity and solenoid optimization. The booster position, gradient and initial phase are optimized at the third stage yielding the minimum emittance at the photo injector exit. Results of the XFEL photo injector optimization will be presented. Besides simulations experimental studies towards XFEL photo injector are carried out. The photo injector test facility at DESY in Zeuthen (PITZ) develops photo injectors for FELs, including FLASH and the European XFEL. A thorough comparison of measured data with results of beam dynamics simulations is one of the main PITZ goals. Detailed experimental studies on photo emission processes, thermal emittance, transverse and longitudinal phase space of the electron beam are being performed together with beam dynamics simulations. This aims to result in better understanding of beam dynamics in high brightness photo injectors. Experimentally obtained photo injector characteristics (like thermal emittance) have to be used in an additional optimization of the photo injector resulting in more realistic beam dynamics simulations. Results of these studies will be reported as well.
2

Gnodtke, Christian, Ulf Saalmann, and Jan-Michael Rost. "Dynamics of photo-activated Coulomb complexes." New Journal of Physics 13, no. 1 (January 21, 2011): 013028. http://dx.doi.org/10.1088/1367-2630/13/1/013028.

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Kimura, Yoshifumi, Tsuyoshi Yamaguchi, and Noboru Hirota. "Photo-excitation dynamics of Phenol Blue." Physical Chemistry Chemical Physics 2, no. 7 (2000): 1415–20. http://dx.doi.org/10.1039/a909485g.

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Masuhara, Hiroshi, Akira Itaya, and Hiroshi Fukumura. "Photo-excitation dynamics of polymeric materials." Kobunshi 38, no. 8 (1989): 832–35. http://dx.doi.org/10.1295/kobunshi.38.832.

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Jacobson, Michele L., and Kathy L. Rowlen. "Photo-dynamics on thin silver films." Chemical Physics Letters 401, no. 1-3 (January 2005): 52–57. http://dx.doi.org/10.1016/j.cplett.2004.11.018.

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Gratz, H., A. Penzkofer, C. Abels, R. M. Szeimies, M. Landthaler, and W. Bäumler. "Photo-isomerisation, triplet formation, and photo-degradation dynamics of indocyanine green solutions." Journal of Photochemistry and Photobiology A: Chemistry 128, no. 1-3 (November 1999): 101–9. http://dx.doi.org/10.1016/s1010-6030(99)00174-4.

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Kumazoe, Hiroyuki, Aravind Krishnamoorthy, Lindsay Bassman, Fuyuki Shimojo, Rajiv K. Kalia, Aiichiro Nakano, and Priya Vashishta. "Photo-induced Contraction of Layered Materials." MRS Advances 3, no. 6-7 (2018): 333–38. http://dx.doi.org/10.1557/adv.2018.127.

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ABSTRACTUltrafast atomic dynamics induced by electronic and optical excitation opens new possibilities for functionalization of two-dimensional and layered materials. Understanding the impact of perturbed valence band populations on both the strong covalent bonds and relatively weaker van der Waals interactions is important for these anisotropic systems. While the dynamics of strong covalent bonds has been explored both experimentally and theoretically, relatively fewer studies have focused on the impact of excitation on weak bonds like van der Waals and hydrogen-bond interactions. We perform non-adiabatic quantum molecular dynamics (NAQMD) simulations to study photo-induced dynamics in MoS2 bilayer. We observe photo-induced non-thermal contraction of the interlayer distance in the MoS2 bilayer within 100 femtoseconds after photoexcitation. We identify a large photo-induced redistribution of electronic charge density, whose Coulombic interactions could explain the observed inter-layer contraction.
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Hashimoto, Hiroshi, Hiroaki Matsueda, Hitoshi Seo, and Sumio Ishihara. "Photo-Induced Dynamics in Charge-Frustrated Systems." Journal of the Physical Society of Japan 83, no. 12 (December 15, 2014): 123703. http://dx.doi.org/10.7566/jpsj.83.123703.

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Miah, M. Idrish, and Lubna Naheed. "Photo-induced excitonic spin dynamics in GaAs." Optical and Quantum Electronics 47, no. 5 (August 13, 2014): 1239–44. http://dx.doi.org/10.1007/s11082-014-9981-4.

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Asham, Mina D., Walid A. Zein, and Adel H. Phillips. "Photo-Induced Spin Dynamics in Nanoelectronic Devices." Chinese Physics Letters 29, no. 10 (October 2012): 108502. http://dx.doi.org/10.1088/0256-307x/29/10/108502.

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You might also be interested in the extended bibliographies on the topic 'Photo-Dynamics' for particular source types:
Journal articles Dissertations / Theses

Dissertations / Theses on the topic "Photo-Dynamics":

1

Kadi, Malin. "Ultrafast Photo-induced Reaction Dynamics of Small Molecules." Doctoral thesis, Uppsala University, Department of Physical Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3597.

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The main focus of this thesis is the investigation of the dissociation dynamics of aryl halides using femtosecond pump-probe spectroscopy. In the monohalogenated aryl halides, iodo-, bromo- and chlorobenzene, the rate of dissociation following excitation at 266 nm in the gas phase increased with increasing mass of the halogen atom. This process was assigned to predissociation of the initially excited singlet (π, π*) state via a repulsive triplet (n, σ*) state due to spin-orbit interaction. In addition to the predissociative mechanism, a direct dissociation channel was observed in iodobenzene. The rate of the predissociation in bromobenzene was found to be faster in the condensed phase than in the gas phase, which can be explained by solvent-induced symmetry perturbations. Ab initio calculations of the potential energy surfaces of the ground state and several low lying excited states in bromobenzene have been performed in order to verify the suggested mechanism. Substituting one of the hydrogen atoms in bromobenzene affected the predissociation rate significantly. In o-, m- and p-dibromobenzene the predissociation rate increased with decreasing distance between the bromine atoms in accordance with an increased spin-orbit interaction introduced by the bromine substituent. The fastest predissociation rate was observed in 1,3,5-tribromobenzene. With chlorine and fluorine substitution, inductive and conjugative effects were found to be of importance. In the o- and m-isomers of the dihalogenated aryl halides, an additional faster dissociation channel was observed. Guided by ab initio calculations of the potential energy surfaces in the dibromobenzene isomers, we ascribed the fast dissociation pathway to predissociation of an initially excited triplet state. Upon methyl group substitution in bromobenzene, the decreased lifetime of the initially excited state was attributed to an incresaed density of coupled states.

Another system which has been studied in the condensed phase is diiodomethane. Using Car-Parrinello molecular dynamics simulations we observed a prompt dissociation and subsequent recombination to the isomer, iso-diiodomethane, in acetonitrile solution.

Vibrational wavepacket dynamics in the C (1Σ+) state of NaK were studied using a direct ionization probing scheme. A simple analytical expression for the pump-probe signal was developed in order to see what factors that govern direct ionization of the vibrational wavepacket. Our experimental data was consistent with a photoionization transition dipole moment that varies with internuclear distance.

2

Eitoku, Takeshi. "Photo-induced conformational dynamics of phototropin LOV domains." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136904.

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Han, Alex Chao. "Coherence and control in photo-molecular wave packet dynamics." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/53991.

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Wave-mechanical phenomena such as resonance and interference, in both light and matter, are central to the principles of quantum coherent control over molecular processes. Focusing on the dynamical aspects, this dissertation is a compilation of studies on the interaction physics involving wave packets in molecules, the driving light field, and the underlying coherence and control. In each work, we will demonstrate interesting correlations between the properties of a carefully designed excitation light field and desirable outcomes of the molecules quantum dynamics. We will analyze the dynamical effect of a Feshbach resonance in the adiabatic Raman photoassociation for ultracold diatomic molecule formation from ultracold atoms. A narrow resonance is shown to be able to increase the effective number of collisions, in an ultracold atomic gas, that are available for photoassociation. This results in an optimal resonance width much smaller than the atomic collision energy bandwidth, due to the balance between the effective collision rate and single-collision transfer probability. Next, we demonstrate the linear molecular response to high-intensity, broadband, shaped optical fields. We show that this originates from interferences based on intra-pulse Raman excitations, and thus response linearity is not unique to the first-order perturbative limit and can not be used to infer the strength of the field. In the last study, we simulate the stochastic vibrational wave packet and dissociation-flux dynamics in a molecule excited by light with temporal and spectral incoherent properties. Between this case and that using a coherent pulse with the same spectral profile, we compare the vibrational wave functions and the loss of electronic and vibrational coherence, and demonstrate the qualitative difference between coherently and incoherently driven dynamics in molecules.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
4

Suddick, Emma C. "Nitrogen photo-chemistry and the dynamics of CDOM in aquatic environments." Thesis, University of Aberdeen, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485377.

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Photochemical ammonium production and photo-bleaching of chromophoric dissolved organic matter (CDOM) kinetics were studied in a variety of aquatic environments including freshwater samples of peatland origin, Caithness, a Tyne Estuary (NE, U.K.) estuary and the Iberian Sea. The main aims of the study were to assess seasonal variability within the peatland catchments, in conjunction with a study of regional and geographical variability of dissolved organic matter (DOM) and ammonium photo-production. Samples collected from a variety of aqueous environments covered the CDaM .absofPtion coefficient at 350 nm (a350) range 0.3 to 69.0 m-I. Selected, filtered samples (n=21) were exposed to natural and artificial light, in order to study ~+ photo-production CDaM photo-bleaching. The photo-chemical degradation of CDaM, as indicated by decreases in a350 over time, also led to increases in the spectral slope of sample absorbance over the wavelength range 290-350 nm, and losses of total fluorescence intensity. In addition we observed hypsochromic shifts of long-wave, humic-like fluorescence (fluorophore A). Photo-chemical ammonium release was observed in 19 of the total 21 irradiation experiments. However the kinetics of ammonium production were complex with 4 of the 21 samples showing a near-linear increase in NH/ concentration while other samples showed an initial lag phase, followed by production and then a decline in NH/ concentrations. In order to assess possible impacts of ~+ release on N balance we estimated NH4+ photoproduction potentials from concentration differences between the initial values and maximum ~+ values divided by irradiation time (i1t). Thus obtained ~+ photo-production potentials between sites ranged from 0 to 3.57 JIM r1 h-I (mean ± stdev 0.7) under solar noon irradiance levels. Using calculated daily sky irradiance and seasonal correction factors, annual depth integrated ~+ photo-production rates were estimated, ranging from 0.06 to 8.05 JIMNm-2 yrI( mean ± stdev 2.73). The photo-chemical production ofNH/ indicates that photo-chemically induced nitrogen release could potentially be an important source of biologically labile nitrogen to aquatic ecosystems, with severe impacts upon the biogeochemistry and nutrient limitation of these environments when compared to N-reservoir size and other N fluxes. However, compared to N deposition photo-ammonification is not a major source ofN. Key words: Dissolved organic matter, chromophoric dissolved organic matter, photoammonification, peatlands, estuaries, marine, and fluorescence.
5

Chavez, Cervantes Mariana [Verfasser], and Isabella [Akademischer Betreuer] Gierz. "Photo-Carrier Dynamics and Photo-Induced Melting of Charge Density Waves in Indium Wires / Mariana Chavez Cervantes ; Betreuer: Isabella Gierz." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1212585143/34.

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Agathangelou, Damianos. "Anabaena Sensory Rhodopsin : effect of mutations on the ultrafast photo-isomerization dynamics." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAE001/document.

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ASR, est une protéine photo réceptrice qui lie la base protonée de la rétine de Schiff dans deux conformations de l'état fondamental. La protéine particulière consiste en un système modèle dans lequel I'effet de l'environnement protéique sur la dynamique d'isomérisation des deux isomères peut être étudié. Dans cette thèse, une étude approfondie sur les protéines mutées ponctuellement est présentée, où la variable est l'environnement protéique. Les résultats montrent des différences significatives entre les durées de vie des états excités des deux isomères et les durées de vie plus courtes ou plus longues commentées en termes de mélange électronique Sl/S2. En complément, le développement expérimental d'un spectromètre à absorption transitoire (T.A) et d'un dispositif de spectroscopie électronique bidimensionnelle (2DES) fonctionnant respectivement dans les domaines spectral NIR et UV-Vis. Avec cette configuration, deux impulsions colinéaires à verrouillage de phase d'une durée inférieure à 10fs sont générées, où. la précision interférométrique sur le contrôle du retard entre les deux impulsions de pompe permet d'effectuer des mesures 2DES
ASR, is a photoreceptor protein that binds the protonated Schiff base of retinal in two ground state conformations. The particular protein consists a model system where the effect of the protein environment on the isomerization dynamics of the two isomers can be investigated. In this thesis an extended study on point mutated proteins is presented where the variable is the protein environment. The results show significant differences between the two isomers excited state lifetimes with the shorter or longer lifetimes commented in terms of Sl/S2 electronic mixing. Supplementary, the experimental development of a Transient absorption spectrometer (T.A) and a Two-dimensional electronic spectroscopy setup (2DES) operating in the NIR and UV-Vis spectral range respectively are described. The 2DES spectrometer is based on translating wedges made out of birefringent material producing two collinear phase-locked pulses with sub-I Ofs duration. The interferometric precision on controlling the delay between the two pump pulses allows to perform 2DES measurements on systems absorbing in the 360-430 nm range allowing to resolve the excitation process spectrally
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Perveaux, Aurelie. "Study of photo induce process by quantum chemistry and quantum dynamics methods." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS144/document.

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C’est dernières années, les progrès des techniques expérimentales combinées avec les simulations théoriques ont données un accès à l’étude et le contrôle des réactions photochimiques dans des systèmes moléculaires de grande taille. Ceci ouvre des portes à de nouvelles applications technologiques. Par exemple, les molécules de la famille du 3-hydroxychromone et de l’aminobenzonitrile sont des types de systèmes où les spectres de fluorescences vont présentés des différences importantes suivant l’environnement du système ou même suivant les substituants utilisés. Ce type de propriété est crucial dans le domaine des matériaux organique, afin de pouvoir comprendre et designer des matériaux qui présentent des propriétés optiques choisis tells que les marqueurs fluorescents dans le domaine médical par exemple.Notre stratégie pour étudier la réactivité photochimique est la suivante: *Explorer la surface d’énergie potentielle et optimiser les points spécifiques avec des calculs de chimie quantiques. Dans un premier temps, on a utilisé des méthodes CASSCF/CASPT2 et la méthode PCM pour décrire les effets de solvant. * Génération des surfaces d énergies potentielles exprimer sous la forme de fonctions analytiques des coordonnées nucléaires. * Résolution de l’équation de Schrödinger dépendant du temps pour les noyaux et pour tout les derges de libertés de la molécule. Cette étape est faite à l’aide de la méthode multilayer multiconfiguration time-dependent hartree (ML-MCTDH)
Over the last decades, progress in experimental techniques combined with theoretical simulations has given access to studying and controlling the photochemical reactivity of large molecular systems with numerous technological applications. 3-hydroxychromone and aminobenzonitrile-like molecules are an example where different fluorescence patterns are observed, depending of the solvent or its substituents. Such properties are crucial in the field of organic materials to understand and design materials with specific optical properties such as fluorescent markers.Our strategy to study the photochemistry reactivity is summarised as follows: * Exploring the potential energy surfaces and optimising specific points with quantum chemistry calculations. In a first stage, these are run at the CASSCF/CASPT2 level of theory with a polarised extended basis set, and the solvent effect is described implicitly with the PCM model. * Generating the full dimension potential energy surfaces as analytical functions of the nuclear coordinates.* Solving the nuclear time-dependent Schrödinger equation for all the degrees of freedom. This is achieved with the multilayer Multi-Configuration Time-Dependent Hartree method (ML-MCTDH)
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Burtt, Kelly D. "Computational studies of photo-induces isomerization dynamics in a model molecular motor system." abstract and full text PDF (free order & download UNR users only), 2005. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3209954.

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Wall, Simon. "Photo-induced dynamics in complex materials probed with femtosecond x-rays and few cycle optical pulses." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510258.

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Pollum, Marvin. "Applying Fundamental Photochemistry to Drive Drug Development: The Photo-Dynamics and Reactions of Sulfur-Substituted Nucleic Acids." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1481287737895585.

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Books on the topic "Photo-Dynamics":

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Langkilde, Frans W. Hexatrienes: Investigations of ground state vibrational spectroscopy, triplet sensitized photo-isomerization, and structure, kinetics and dynamics of the lowest excited triplet state. Roskilde: Riso National Laboratory, 1986.

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Chemistry, Royal Society of. Time-Resolved Imaging of Photo-induced Dynamics: Faraday Discussion 228. Royal Society of Chemistry, The, 2021.

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Ledgerwood, Melanie L. Phonon dynamics and self-energy effects in highly photo-excited germanium. 1995.

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Henriksen, Niels Engholm, and Flemming Yssing Hansen. Unimolecular Reactions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198805014.003.0007.

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This chapter considers unimolecular reactions; photo-induced reactions, that is, true unimolecular reactions; and reactions initiated by collisional activation, that is, apparent unimolecular reactions where it is assumed that the time scales for activation and subsequent reaction are well separated. Elements of classical and quantum dynamical descriptions are discussed, including Slater theory and the quantum mechanical description of photo-induced reactions. Statistical theories aiming at the calculation of micro-canonical as well as canonical rate constants are discussed, including a detailed discussion of RRKM theory. It concludes with a discussion of femtochemistry, that is, the observation and control of chemical dynamics using femtosecond pulses of electromagnetic radiation, focusing on the control of unimolecular reactions via the interaction with coherent light; that is, laser control.
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Brown, Ruth Nicole. When Black Girls Look at You. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252037979.003.0004.

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This chapter considers what it means to be seen and looked at as a Black girl. Building on the visual-poetic analysis of June Jordan's (1969) Who Look at Me and M. NourbeSe Philip's (2008) Zong!, the chapter offers an “anti-narrative photo-poem” that couples photography, poetry, and intersubjective insights of Black girlhood to specifically address the institutional norms and interpersonal dynamics that govern their lives and promote a limited knowing of Black girls premised on sight alone. The primary purpose of this chapter is to show that Black girls actively decide who and what is worthy of their presence and attention. The anti-narrative photo-poem invites those who dare to look to answer with action, as June Jordan suggested, but to do so while giving attention to the kinds of nuanced intersubjective interactions that hinge on the particular usable truth that Black girls are looking at you, watching them.
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Croken, Ryan. Obama bin Laden [sic]. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252038860.003.0009.

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This chapter examines the cultural “confusion” that existed in the United States between Osama bin Laden and Barack Obama. It uses the cultural slippages (Obama/Osama), conspiratorial elisions (Obama is Osama), and religious assumptions (Obama, like Osama, is Muslim) that surround Osama and Obama as points for analyzing racialized dynamics that underlie narratives of U.S. exceptionalism, military power, and global dominance. It identifies some of the myriad streams through which popular culture effects its messages: T-shirts, web tools (photo morphing), memes, hip-hop, tweets, YouTube videos, and the like. Attending to these media formats is an essential component of examining sense-making across the complexities of U.S. cultures. The chapter argues that the “confusion” between Osama and Obama is more than just difficulty with name pronunciation, lack of familiarity with Islam, or merging of nonwhite skin color, but is instead a complex negotiation of racial intersections with national narratives.
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Naidu, Ravi, Euan Smith, Gary Owens, Prosun Bhattacharya, and Peter Nadebaum. Managing Arsenic in the Environment. CSIRO Publishing, 2006. http://dx.doi.org/10.1071/9780643093515.

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Arsenic is one of the most toxic and carcinogenic elements in the environment. This book brings together the current knowledge on arsenic contamination worldwide, reviewing the field, highlighting common themes and pointing to key areas needing future research. Contributions discuss methods for accurate identification and quantification of individual arsenic species in a range of environmental and biological matrices and give an overview of the environmental chemistry of arsenic. Next, chapters deal with the dynamics of arsenic in groundwater and aspects of arsenic in soils and plants, including plant uptake studies, effects on crop quality and yield, and the corresponding food chain and human health issues associated with these exposure pathways. These concerns are coupled with the challenge to develop efficient, cost effective risk management and remediation strategies: recent technological advances are described and assessed, including the use of adsorbants, photo-oxidation, bioremediation and electrokinetic remediation. The book concludes with eleven detailed regional perspectives of the extent and severity of arsenic contamination from around the world. It will be invaluable for arsenic researchers as well as environmental scientists and environmental chemists, toxicologists, medical scientists, and statutory authorities seeking an in-depth view of the issues surrounding this toxin.

Book chapters on the topic "Photo-Dynamics":

1

Mellema, Garrelt. "Photo-Ionization Dynamics Simulation." In Lecture Notes in Computational Science and Engineering, 307–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88857-4_10.

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Gilhaus, H., R. Blatt, W. Neuhauser, and P. E. Toschek. "Photo-Dynamics of a Single Trapped Three-Level Ion." In Coherence and Quantum Optics VI, 411–14. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-0847-8_75.

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Sasaki, M., G. X. Tai, M. Koyano, H. Negishi, and M. Inoue. "Photo-Induced Carrier Dynamics of YBa2Cu3O7-δ Thin Films." In Springer Proceedings in Physics, 307–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77154-5_63.

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Oshikiri, Mitsutake, Akiyuki Matsushita, Jinhua Ye, and Mauro Boero. "The Dynamics of Water Molecules on YVO4 Photo-Catalyst Surface." In Ceramic Transactions Series, 237–41. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470640845.ch33.

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Wraback, M., J. Tauc, D. Pang, W. Paul, and Z. Vardeny. "Femtosecond Dynamics of Photo-Generated Carriers in Amorphous Hydrogenated Germanium." In Springer Series in Chemical Physics, 306–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84269-6_93.

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Lücke, A., T. Biktagirov, A. Riefer, M. Landmann, M. Rohrmüller, C. Braun, S. Neufeld, U. Gerstmann, and W. G. Schmidt. "Photo-Excited Surface Dynamics from Massively Parallel Constrained-DFT Calculations." In High Performance Computing in Science and Engineering ' 17, 157–68. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68394-2_9.

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Bochenkova, Anastasia V., and Lars H. Andersen. "Photo-initiated Dynamics and Spectroscopy of the Deprotonated Green Fluorescent Protein Chromophore." In Photophysics of Ionic Biochromophores, 67–103. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40190-9_5.

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Conti, Irene, Matteo Bonfanti, Artur Nenov, Ivan Rivalta, and Marco Garavelli. "Photo-Active Biological Molecular Materials: From Photoinduced Dynamics to Transient Electronic Spectroscopies." In Challenges and Advances in Computational Chemistry and Physics, 77–142. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57721-6_2.

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Koshihara, S., K. Akimoto, Y. Tokura, K. Takeda, and T. Koda. "Domain-Wall Dynamics of Photo-Induced Phase Transition in Polydiacetylene Single Crystals." In Springer Series in Solid-State Sciences, 105–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60702-8_11.

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Kimura, Yoshifumi, Yoshinori Yamamoto, and Masahide Terazima. "Photo-thermalization dynamics of azulene in supercritical fluids studied by the transient grating method." In Springer Series in Chemical Physics, 398–400. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27213-5_122.

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Conference papers on the topic "Photo-Dynamics":

1

Sang Kyu, Kim. "Time-resolved reaction dynamics in photo-dissociation and photo-detachment." In Asian Spectroscopy Conference 2020. Institute of Advanced Studies, Nanyang Technological University, 2020. http://dx.doi.org/10.32655/asc_8-10_dec2020.38.

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Gudyma, Yuri V., and Oleksander M. Semenko. "Nonequilibrium photo-induced dynamics of spin crossover compounds." In SPIE Proceedings, edited by Oleg V. Angelsky. SPIE, 2004. http://dx.doi.org/10.1117/12.559857.

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Sharma, Chhavi, and Mahesh Kumar. "Probing ultrafast dynamics of photo-excited Bismuth nanostructure." In 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC). IEEE, 2019. http://dx.doi.org/10.23919/ursiap-rasc.2019.8738275.

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Tsopelas, Ilias, Yannis Kominis, Kyriakos Hizanidis, Nikolaos Efremidis, Sotiris Droulias, Lambros Halastanis, Georgios Papazisimos, Nikolaos Moshonas, and Panagiotis Papagiannis. "Soliton dynamics and interactions in dynamically photo-induced lattices." In SPIE Proceedings, edited by Valentin I. Vlad. SPIE, 2007. http://dx.doi.org/10.1117/12.757853.

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Tsopelas, Ilias, Yannis Kominis, Kyriakos Hizanidis, Lambros Halastanis, Georgios Papazisimos, Nikolaos Efremidis, Nikolaos Moshonas, Sotirios Droulias, and Panagiotis Papagiannis. "Soliton dynamics and interactions in dynamically photo-induced lattices." In Photonics Europe, edited by John T. Sheridan and Frank Wyrowski. SPIE, 2006. http://dx.doi.org/10.1117/12.663233.

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Liu, Maning, Mohamed Abodya, Weisi Dai, Tokuhisa Kawawaki, Ai Shimazaki, Ryota Sato, Masaki Saruyama, Toshiharu Teranishi, Atsushi Wakamiya, and Yasuhiro Tachibana. "Photo-Induced Charge Carrier Dynamics of Metal Halide Perovskite." In 2022 29th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD). IEEE, 2022. http://dx.doi.org/10.23919/am-fpd54920.2022.9851264.

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7

Munjal, Pooja, and Kamal P. Singh. "Optically probing sub-nanometer photo-dynamics of solid surfaces." In 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC). IEEE, 2019. http://dx.doi.org/10.23919/ursiap-rasc.2019.8738214.

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Morris, Denis, Nathalie Perret, Daria A. Riabinina, Jean Beerens, Vincent Aimez, Jacques Beauvais, and Simon Fafard. "Dynamics of photo-excited carriers in self-assembled quantum dots." In IC02, edited by Roger A. Lessard, George A. Lampropoulos, and Gregory W. Schinn. SPIE, 2003. http://dx.doi.org/10.1117/12.473944.

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Ulbricht, Ronald, Shuo Dong, Julian Schwartz, Hyeon-Deuk Kim, Yoshitaka Tanimura, Bala Murali Krishna Mariserla, Keshav M. Dani, and Zhi-Heng Loh. "Ultrafast Photo-Excitation Dynamics of Nitrogen-Vacancy Defects in Diamond." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/cleo_qels.2015.ftu4b.7.

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Wraback, M., J. Tauc, D. Pang, W. Paul, J. K. Lee, E. A. Schiff, and Z. Vardeny. "Femtosecond Dynamics of Photo-generated Carriers in Amorphous Hydrogenated Germanium." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/up.1990.thc16.

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Abstract:
Significant improvement in the optoelectronic properties of amorphous hydrogenated germanium (a-Ge:H) has recently been attained, and this material may become of greater technological interest in the near future. It is also an attractive physical system for femtosecond pump and probe studies with 2eV photons because with an optical gap of 1.06eV it allows studies of dynamics of photoexcited carriers with large excess energy in the band states, in contrast to similar experiments1,2 on the extensively studied a-Si:H, where the optical gap is 1.8eV and the carriers have very little excess energy.

Reports on the topic "Photo-Dynamics":

1

Nemanich, Robert J., Harald W. Ade, and Robert F. Davis. Development of a Photo Electron Emission Microscopy-Free Electron Laser System (PEEM-FEL) for Studies of the Dynamics of Surface Processing and Epitaxial Growth. Fort Belvoir, VA: Defense Technical Information Center, July 1998. http://dx.doi.org/10.21236/ada351027.

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Muldavin, Esteban, Yvonne Chauvin, Teri Neville, Hannah Varani, Jacqueline Smith, Paul Neville, and Tani Hubbard. A vegetation classi?cation and map: Guadalupe Mountains National Park. National Park Service, 2024. http://dx.doi.org/10.36967/2302855.

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Abstract:
A vegetation classi?cation and map for Guadalupe Mountains National Park (NP) is presented as part of the National Park Service Inventory & Monitoring - Vegetation Inventory Program to classify, describe, and map vegetation communities in more than 280 national park units across the United States. Guadalupe Mountains NP lies in far west Texas and contains the highest point in the state, Guadalupe Peak (8,751 ft; 2,667 m). The mountain escarpments descend some 5,000 ft (1,500 m) to the desert basins below forming a complex geologic landscape that supports vegetation communities ranging from montane coniferous forests down to desert grasslands and scrub. Following the US National Vegetation Classi?cation (USNVC) standard, we identi?ed 129 plant associations hierarchically tiered under 29 groups and 17 macrogroups, making it one of the most ecologically diverse National Park Service units in the southwestern United States. An aspect that adds to this diversity is that the park supports communities that extend southward from the Rocky Mountains (?ve macrogroups) and Great Plains (one macrogroup) and northward from the Chihuahuan Desert (two macrogroups) and Sierra Madre Orientale of Mexico (three macrogroups). The remaining six macrogroups are found in the Great Basin (one macrogroup), and throughout the southwestern United States (remaining ?ve macrogroups). Embedded in this matrix are gypsum dunelands and riparian zones and wetlands that add further complexity. We describe in detail this vegetation classi?cation, which is based on 540 vegetation plots collected between 2006 and 2010. Full descriptions and diagnostic keys to the plant associations along with an overall plant species list are provided as appendices. Based on the vegetation classi?cation and associated plot data, the vegetation map was developed using a combined strategy of automated digital object-oriented image classi?cation and direct-analog image interpretation of four-band National Agricultural Imagery Program (NAIP) aerial photography from 2004 and 2008 and Landsat Thematic Mapper satellite imagery. The map is designed to facilitate ecologically-based natural resource management at a 1:24,000 scale with 0.5-ha minimum map unit size. The map legend is hierarchically structured: the upper Level 1 consists of 16 map units corresponding in most cases to the USNVC group level, and an additional map unit describing built-up land and agriculture; Level 2 is composed of 48 nested map units re?ecting various combinations of plant associations. A ?eld-based accuracy assessment using 341 vegetation plots revealed a Level 1 overall accuracy of 79% with 90% CI of 74?84% and 68% with 90% CI of 59?76% at Level 2. An annotated legend with summary descriptions of the units, distribution maps, aerial photo examples of map unit polygons, and representative photos are provided in Appendix D. Large wall-size poster maps at 1:35,000 scale were also produced following NPS cartographic standards. The report, plot data, and spatial layers are available at National Park Service Vegetation Mapping Program https://www.nps.gov/im/vegetation-inventory.htm). Outcomes from this project provide the most detailed vegetation classi?cation and highest resolution mapping for Guadalupe Mountains NP to date to support many uses including ?re, recreation, vegetation, and wildlife management, among others. The upper Level 1 map is particularly suited to landscape-scale, park-wide planning and linkages to its sister park, Carlsbad Caverns NP. The Level 2 mapping provides added detail for use at a more localized project scale. The overall accuracy of the maps was good, but because Guadalupe Mountains NP is primarily wilderness park, there were logistical challenges to map development and testing in remote areas that should be considered in planning management actions. In this context, some map units would bene?t from further development and accuracy assessment. In particular, a higher resolution mapping of McKittrick Creek riparian habitat at 1:6,000 scale or ?ner is recommended for this important habitat in the park. In addition, developing a structural canopy height model from LiDAR imagery would be useful to more accurately quantify woody canopy density and height to support ?re management and other habitat management issues. With respect to understanding vegetation dynamics in this time of rapid environmental change, the 540 vegetation plots themselves are su?ciently georeferenced and have the data resolution to be useful in detecting change at the decadal scales across much of the park. To this end, an additional recommendation would be to install more plots to ?ll the gaps among the main vegetation units of the park, both spatially and thematically. Overall, the Vegetation and Classi?cation Map for Guadalupe Mountains NP will support the park?s management e?orts and enhance regional understanding of vegetation and ecology of ecosystems of the southwestern United States.
3

O'Connell, Kelly, David Burdick, Melissa Vaccarino, Colin Lock, Greg Zimmerman, and Yakuta Bhagat. Coral species inventory at War in the Pacific National Historical Park: Final report. National Park Service, 2024. http://dx.doi.org/10.36967/2302040.

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Abstract:
The War in the Pacific National Historical Park (WAPA), a protected area managed by the National Park Service (NPS), was established "to commemorate the bravery and sacrifice of those participating in the campaigns of the Pacific Theater of World War II and to conserve and interpret outstanding natural, scenic, and historic values on the island of Guam." Coral reef systems present in the park represent a vital element of Guam?s cultural, traditional, and economical heritage, and as such, are precious and in need of conservation. To facilitate the management of these resources, NPS determined that a scleractinian (stony coral) species survey was necessary to establish a baseline for existing coral communities and other important factors for conservation. EnviroScience, Inc. performed a survey of stony coral species, coral habitat, and current evidence of stressors at WAPA?s H?gat and Asan Units in 2022. This report summarizes these findings from a management perspective and compares its findings to previous survey data from 1977 and 1999 (Eldridge et al. 1977; Amesbury et al. 1999). WAPA is located on the tropical island of Guam, located on the west-central coast of the island, and encompasses 2,037 acres. Underwater resources are a significant component of the park, as 1,002 acres consists of water acres. The park is comprised of seven units, of which two of these, the H?gat and Asan Beach Units, include all the oceanic water acres for the park. The H?gat Beach Unit (local spelling, formerly known as ?Agat?) is located at the south-west portion of the park and consists of 38 land acres and 557 water acres (NPS 2003). The Asan Beach Unit consists of 109 acres of land and 445 water acres (NPS 2003). A current baseline for existing coral communities and other important factors for conservation necessitates the need for up-to-date data on the location, presence, relative abundance, and present health of corals. Park managers need this updated data to determine where and how to best focus conservation priorities and identify restoration opportunities. Management actions in park reef areas informed by this inventory included identifying locations where there were: high rates of sedimentation; high coral biomass; rare or threatened species, with a priority given to species endemic to Guam and listed as ?threatened? under the U.S. Endangered Species Act (ESA; Acropora globiceps, A. retusa, A. speciosa, and Seriatopora aculeata); coral persistence and decline, disease and/or nuisance species, including the crown-of-thorns starfish (Acanthaster cf. solaris, ?COTS?) and the sponge Terpios hoshinota; and bleached areas. All work carried out was in accordance with the NPS statement of work (SOW) requirements, which involved a quantitative inventory using both new and pre-existing transects. The resulting transects totaled 61 (including the four from the 1999 study), each measuring 50 meters in length and distributed across depths of up to 50 feet. Divers took photo-quadrat samples covering an area of approximately 9 m?, encompassing 50 photo-quadrats of dimensions 0.50 m x 0.36 m (n=50). The collective area surveyed across all 61 transects amounted to ~549 m?. Additionally, a qualitative search was conducted to enhance documentation of coral species that have limited distribution and might not be captured by transects, along with identifying harmful species and stressors. Timed roving diver coral diversity surveys were carried out at a total of 20 sites occurring within the waters of WAPA, including eight sites at the H?gat unit and 12 sites at the Asan unit. The findings from this report reveal significant disparities in benthic cover compositions between H?gat and Asan units. The H?gat unit exhibits high abundances of turf algae and unconsolidated sediment while the Asan beach unit presents a different scenario, with hard coral as the dominant benthic cover, followed closely by crustose coralline algae (CCA). The Asan unit is also more difficult to access from shore or boat relative to H?gat which provides that unit some protection from human influences. The Asan beach unit's prevalence of hard coral, CCA, and colonizable substrate suggests a more favorable environment for reef growth and the potential benefits of maintaining robust coral cover in the area. These distinct differences in benthic communities highlight the contrasting ecological dynamics and habitats of the two study areas. Across both H?gat and Asan beach unit transects, a total of 56 hard coral species were recorded from 27 genera, with 44 species recorded from the H?gat unit and 48 species recorded from the Asan unit. Of the four historical transects surveyed in the Asan unit from 1999, three experienced declines in percent coral cover (17.38-78.72%), while the fourth had an increase (10.98%). During the timed roving diver coral diversity surveys, a total of 245 hard coral species, including 241 scleractinian coral species representing 49 genera and 4 non-scleractinian coral species representing 4 genera were recorded. Uncertainties related to coral identification, unresolved boundaries between morphospecies, differences in taxonomists' perspectives, and the rapidly evolving state of coral taxonomy have significant implications for species determinations during coral diversity surveys. While the recent surveys have provided valuable insights into coral diversity in WAPA waters, ongoing taxonomic research and collaboration among experts will be essential to obtain a more comprehensive and accurate understanding of coral biodiversity in the region. Of the several ESA coral species that were searched for among the H?gat and Asan beach units, Acropora retusa was the only coral species found among quantitative transects (n=2) and A. globiceps was observed during coral diversity surveys. Acropora speciosa, which was dominant in the upper seaward slopes in 1977, is now conspicuously absent from all the surveys conducted in 2022 (Eldredge et al., 1977). The disappearance and reduction of these once-dominant species underscores the urgency of implementing conservation measures to safeguard the delicate balance of Guam's coral reefs and preserve the diversity and ecological integrity of these invaluable marine ecosystems. Other formerly common or locally abundant species were infrequently encountered during the diversity surveys, including Acropora monticulosa, A. sp. ?obtusicaulis?, A. palmerae, Stylophora sp. ?mordax?, Montipora sp. ?pagoensis?, and Millepora dichotoma. Significant bleaching-associated mortality was recorded for these species, most of which are restricted to reef front/margin zones exposed to moderate-to-high levels of wave energy. Sedimentation was present in both H?gat and the Asan units, though it was more commonly encountered in H?gat transects. While significant portions of the reef area within the WAPA H?gat unit are in poor condition due to a variety of stressors, some areas still hosted notable coral communities, which should be a potential focus for park management to prevent further degradation. There is a need for more effective management of point source pollution concerns, particularly when subpar wastewater treatment or runoff from areas with potential pollution or sediment-laden water is flowing from nearby terrestrial environments. Future monitoring efforts should aim to establish a framework that facilitates a deeper understanding of potential point source pollution incidents. This would empower park managers to collaborate with adjacent communities, both within and outside of park boundaries, to mitigate the localized impacts of pollution (McCutcheon and McKenna, 2021). COTS were encountered during transect surveys as well as in coral diversity surveys. including along the upper reef front/reef margin at site Agat-CS-2. The frequency of these observations, particularly in the WAPA H?gat unit and where stress-susceptible corals are already uncommonly encountered, raise concern about the ability of the populations of these coral species to recover following acute disturbance events, and calls in to question the ability of some of these species to persist in WAPA waters, and in Guam?s waters more broadly. More frequent crown-of-thorns control efforts, even if only a handful of sea stars are removed during a single effort, may be required to prevent further loss to vulnerable species. There were several documented incidents of Terpios hoshinota covering large sections of branching coral in the reef flat along transects, but it is still unclear how detrimental this sponge is to the overall reef system. There is a concern that elevated levels of organic matter and nutrients in the water, such as those resulting from sewage discharge or stormwater runoff, could lead to increased Terpios populations (De Voogd et al. 2013). Consequently, it is important to track populations in known areas of sedimentation and poor water quality. The presence of unique species at single survey sites within the study areas underscores the ecological importance of certain locations. Some species are known to occur in other locations in Guam, while a few may be limited to specific sites within WAPA waters. These differences are likely influenced by environmental and biological factors such as poor water quality, severe heat stress events, chronic predation by crown-of-thorns sea stars, disease, and reduced herbivore populations. These factors collectively shape the condition of the benthic community, leading to variations in species distribution and abundance across the study sites. Documenting coral stress and identifying potentially harmful species allows for proactive management strategies to prevent the establishment of nuisance or detrimental species while populations are still manageable. Updated data on the location, presence, relative abundance, and health of corals is essential for park managers to prioritize conservation efforts and identify restoration opportunities effectively. Observations from this report raise concerns about the health and resilience of coral ecosystems in the H?gat unit and emphasize the need for knowledge of local factors that shape benthic community structure. Understanding the drivers responsible for these variations is crucial for effective conservation and management strategies to preserve the ecological balance and overall health of coral reefs in both units. Continued monitoring efforts will be critical in assessing long-term trends and changes in benthic cover and enabling adaptive management approaches to safeguard these valuable marine ecosystems in the face of ongoing environmental challenges.

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