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Dissertations / Theses on the topic 'Multiphoton Ionization'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hatherly, P. A. "The multiphoton multiple ionization of molecules." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234654.

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2

Purvis, John. "R-matrix-Floquet Theory of multiphoton ionization." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239216.

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3

Strahand, M. A. "Time resolved multiphoton ionization of aromatic molecules." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377723.

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4

Flood, R. V. "Resonance enhanced multiphoton ionization studies of I2 and IBr." Thesis, University of Edinburgh, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.650978.

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The resonance enhanced multiphoton ionization (REMPI) spectra of I<SUB>2</SUB> and IBr have been recorded at room temperature in a static cell and in a supersonic-jet (circa. 20K). The results of both sets of data provide an interesting contrast between two similar, yet distinct species. The room temperature REMPI spectrum of I<SUB>2</SUB> has been recorded in the region 48000-75300cm<SUP>-1</SUP> using both linearly and circularly polarized light. Rydberg states (ns) up to n = 11, based on the [3/2]<SUB>g</SUB> ionic core, and up to n = 8 based on the [1/2]<SUB>g</SUB> ionic core, have been o

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5

Clement, Simon Glyn. "Resonance enhanced multiphoton ionization spectroscopy of the imidogen radical." Thesis, University of Bristol, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335551.

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6

Cross, Gillian M. "The multiphoton multiple ionization of molecules in intense laser fields." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283758.

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7

Giles, Adrian J. "The multiphoton multiple ionization of molecules in intense laser fields." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387706.

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8

Blease, Trevor Graham. "Laser multiphoton ionization spectroscopy and analysis of the xylene isomers." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/14139.

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9

Dundas, Daniel. "A visual analysis of laser-driven two-electron atomic wavepackets." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266704.

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10

Nemeth, Gregory Richard Alexander James. "Multi-electron dynamics investigated with strong-field tunnelling and XUV photoionization." Thesis, Swansea University, 2011. https://cronfa.swan.ac.uk/Record/cronfa42905.

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11

Golin, Sarah M. "Studies of Crystal Structure Using Multiphoton Transitions in GaAs." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23369.

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We demonstrate experimentally that the multiphoton ionization rate in gallium arsenide depends on the alignment of the laser polarization with respect to the crystal axis. We show real-time modulation of 1900nm laser ionization rate, through viewing transmission, which mimics the symmetry of the semiconductor crystal. We propose that the modulation in the ionization rate arises because the varying reduced effective carrier mass, as predicted by Keldysh theory. We show direct comparison of the experimental transmission modulation depth with that predicted by Keldysh theory. This opens up a nove

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12

Urbanek, Janus [Verfasser]. "Multiphoton Ionization and Recombination Dynamics in Liquid-to-Supercritical Ammonia / Janus Urbanek." Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1052581943/34.

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13

Shchemelyov, Sergey. "Sum-frequency generation and multiphoton ionization in xenon under excitation by conical laser beams /." Online version, 2006. http://dspace.utlib.ee/dspace/bitstream/10062/1001/5/shchemelyovsergey.pdf.

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14

Gillen, Glen D. "Multiphoton and above-threshold ionization of magnesium using high-intensity ti: sapphire laser pulses." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1302012656.

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15

Gillen, Glen D. "Multiphoton and above-threshold ionization of magnesium using high-intensity titanium-sapphire laser pulses /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486461246818111.

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16

Huang, Shu. "Investigating multiphoton phenomena using nonlinear dynamics." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22558.

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Thesis (Ph. D.)--Physics, Georgia Institute of Technology, 2008.<br>Committee Chair: Uzer, Turgay; Committee Member: Aral, Mustafa; Committee Member: Flannery, Raymond; Committee Member: Raman, Chandra; Committee Member: Schatz, Michael.

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17

Barc´, Bartlomiej. "Hydrated clusters of nucleic acid bases in supersonic beams probed by multiphoton ionization (MPI) mass spectrometry." Thesis, Open University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.576663.

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In the present thesis clusters of nucleic acid bases and water are used as model systems of cellular DNA to investigate UV induced radiation damage in the gas phase. A new experimental system has been designed and commissioned to perform rnultiphoton ionization experiments on hydrogen bonded clusters of the nucleic acid bases: adenine, thymine and uracil, as well as on the related chromciphores: 5-fluorouracil and hypoxanthine. As the result of pulsed nanosecond laser irradiation in the wavelength range of 220-230 nm. cluster, monomer and fragment ions were detected using a time-of-flight mass

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18

Braunstein, Matthew McKoy Vincent McKoy Vincent. "Photoionization dynamics and ion state distributions in single-photon and resonance enhanced multiphoton ionization of molecules /." Diss., Pasadena, Calif. : California Institute of Technology, 1991. http://resolver.caltech.edu/CaltechETD:etd-06182007-133055.

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19

Chirilă, Ciprian Constantin. "Analysis of the strong field approximation for harmonic generation and multiphoton ionization in intense ultrashort laser pulses." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/10633/.

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We apply the strong field approximation (SFA) to the study of harmonic generation (HG) and above threshold ionization (ATI) in intense low-frequency laser fields. We review in a systematic way the SFA model from the literature to date, and fill in some gaps regarding its analytical and computational aspects. Special attention is devoted to the analysis of the saddle point method, which is widely used to calculate the highly oscillatory integrals describing the physical processes. Its accuracy is compared against the results from numerical integration; for the latter task, we propose two method

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20

Goetz, Ruben Esteban [Verfasser]. "Quantum optimal control theory of photoelectron spectroscopy : Signature of Chirality and theoretical description of multiphoton ionization / Ruben Esteban Goetz." Kassel : Universitätsbibliothek Kassel, 2019. http://d-nb.info/1190048027/34.

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21

Wong, Michael C. H. "High Harmonic Spectroscopy of Complex Molecules." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31640.

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Advancements in spectroscopy rely on the improvement of two fundamental characteristics: spatial and temporal resolutions. High harmonic spectroscopy (HHS) is an emerging technology that promises the capability of studying the fastest processes that exist today: electronic motion with angstrom spatial and attosecond temporal resolution. HHS is based on the process of high harmonic generation (HHG) which arises from the nonlinear interaction between an intense, infrared laser pulse and an atomic or molecular gaseous medium, producing coherent, attosecond-duration bursts of extreme ultraviolet

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22

Froß, Patrick [Verfasser], and Robert [Akademischer Betreuer] Moshammer. "Electron-nuclear correlation, singly-excited Rydberg states and electron emission asymmetry in multiphoton ionization of H2 / Patrick Froß ; Betreuer: Robert Moshammer." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1220429708/34.

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23

Kurz, Niels [Verfasser], and Alexander [Akademischer Betreuer] Dorn. "Kinematically complete multiphoton ionization studies on optically trapped 6Li and 6Li_2 created by single-color photoassociation / Niels Kurz ; Betreuer: Alexander Dorn." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1225558050/34.

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24

Zapata, Abellán Felipe. "Electron dynamics induced by single and multiphoton processes in atoms and molecules." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS431.

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Cette thèse contribue aux développements de méthodes numériques utilisées pour reproduire la dynamique électronique induite par des processus à un et plusieurs photons dans les atomes et molécules. Dans le domaine perturbatif, la photoexcitation et la photoionisation ont été étudiées à l'aide de la théorie de la fonctionnelle de la densité à séparation de portée, dans le but de prendre en compte les effets d'interaction électron-électron. De plus, dans le domaine non-perturbatif, les spectres au-delà du seuil d'ionisation et les spectres de génération d'harmoniques d'ordres élevés ont été simu

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25

Olanrewaju, Babajide O. "Non-thermal processes on ice and liquid micro-jet surfaces." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39475.

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Processes at the air-water/ice interface are known to play a very important role in the release of reactive halogen species with atmospheric aerosols serving as catalysts. The ability to make different types of ice with various morphologies, hence, different adsorption and surface properties in vacuum, provide a useful way to probe the catalytic effect of ice in atmospheric reactions. Also, the use of the liquid jet technique provides the rare opportunity to probe liquid samples at the interface; hitherto impossible to investigate with traditional surface science techniques. Studies of reactio

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26

Ferreira, Paulo Henrique Dias. "Produção de nanopartículas de Au induzida por pulsos laser de femtossegundos formatados." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-19012012-083752/.

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Neste trabalho investigamos a dinâmica de formação de nanopartículas de Au por pulsos de femtossegundos formatados (800 nm, 30 fs, 1 kHz e 2 mJ), induzida pela ionização da molécula de quitosana. Inicialmente desenvolvemos um sistema de formatação de pulsos ultracurtos que faz uso de um modulador espacial de luz, constituído por um arranjo linear de cristais líquidos, com o qual somos capazes de impor distintas modulações de fase ao pulso laser. Para monitorar o processo de produção de nanopartículas, montamos um sistema de excitação (pulsos de femtossegundos) e prova (luz branca), o qual perm

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27

Shepperd, Kristin. "Low-energy electron induced processes in hydrocarbon films adsorbed on silicon surfaces." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29648.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2010.<br>Committee Chair: Orlando, Thomas; Committee Member: El-Sayed, Mostafa; Committee Member: First, Phillip; Committee Member: Lackey, Jack; Committee Member: Tolbert, Laren. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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28

Mah, Kelly Robert Lim. "Investigations of resonantly enhanced multiphoton ionizations of atomic mercury and potassium." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26451.

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Two investigations are reported on the application of resonantly enhanced multiphoton ionization (RMPI) to gaseous mixtures of an atomic vapor and a few Torr of argon. Photon fluxes large enough to ionize atoms by RMPI were produced by focussing down the light from a tunable pulsed dye laser. The irradiances generated were of the order of 500MWcm⁻². Ionization was detected by a voltage biased wire electrode that simply collected the photoelectrons either directly or after some gas multiplication. One investigation was the measurement of the dependence of RMPI processes in mercury on the polari

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29

Jobunga, Eric Ouma. "Beyond-the-dipole effects in strong-field photoionization using short intense laser pulses." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17653.

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Die Entwicklung Freier-Elektronen-Laser und einer neuen Generation von Strahlungsquellen erlaubt die Realisierung hoher Intensitäten und kurzer Pulsdauern. Im Regime niedriger Laserintensitäten war bisher die Dipolnäherung recht erfolgreich bei der Beschreibung der durch die Licht-Materie-Wechselwirkung erzeugten Dynamik, wodurch viele experimentell beobachtete Resultate reproduziert werden konnten. Bei den durch die neuen Strahlungsqullen erzeugten bisher unerreichten Intensitäten und Rönten-Wellenlängen kann die Dipolnäherung allerdings zusammenbrechen. Höhere Multipol-Wechselwirkungen, die

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30

L'Huillier, Anne. "Ionisation multiphotonique et multielectronique." Paris 6, 1986. http://www.theses.fr/1986PA066268.

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Premiere mise en evidence experimentale d'ions multicharges de gaz rares crees par absorption multiphotonique a 532 et 1064 nm, pour differentes annees de l'impulsion laser (5 a 200 ps). Etude theorique utilisant un formalisme derive de la theorie des perturbations a n corps et des techniques diagrammatiques pour l'ionisation simple et double multiphotonique d'un atome a plusieurs electrons non independants

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31

Poirier, Michel. "Ionisation multiphotonique résonnante et génération d'harmonique trois." Paris 6, 1986. http://www.theses.fr/1986PA066538.

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L'ionisation multiphotonique résonnante d'une vapeur atomique est très sensible à la pression: même en l'absence d'effets collisionnes importants, les processus de génération d'harmonique 3 photons. Développement de plusieurs modèles pour en rendre compte: théorie du champ moyen, approximation quasi statique, approximation de faible dépeuplement. Nouvelle méthode d'analyse de l'effet Stark dynamique, appliquée a une expérience sur hg pour déterminer les paramètres de la génération d'harmoniques. En accord avec l'expérience, disposition des résonances à 4 photons à haute pression.

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32

Hemici, Mustapha. "Spectroscopie laser sur niveaux électroniques excités d'excimères et d'ions de gaz rares." Saint-Etienne, 1994. http://www.theses.fr/1994STET4015.

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Des études des états excités d'excimères et d'ions de gaz rares ont été réalisées en combinant spectroscopie de l'ultraviolet du vide (VUV) et spectroscopie laser résolue en temps. Les états électroniques 1u, 0u- relaxés, de l'excimère de krypton sont préparés par une excitation atomique vuv fournie par l'émission monochromatisée d'un plasma laser d'argon. La réexcitation est réalisée par un laser à colorant accordable décalable en temps vis-à-vis de la première excitation. Cette réexcitation fournit une information d'une part purement moléculaire et d'autre part combinée atomique et moléculai

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33

文長治. "Multiphoton ionization spectroscopy of nitrogen oxide." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/81306308236685108116.

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34

Dubs, Richard Leslie. "Single- and Multiphoton Ionization Processes in Molecules." Thesis, 1988. https://thesis.library.caltech.edu/7411/1/Dubs_rl_1988.pdf.

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<p>This dissertation is theoretical in nature and can be separated into two main areas: 1) single- and multiphoton ionization studies of a novel photoelectron effect, and 2) single-photon ionization studies of simple clusters as models for adsorbate photoemission. The first area centers on the phenomenon of circular dichroism in photoelectron angular distributions (CDAD). CDAD is shown to exist from oriented linear molecules, adsorbed atoms, and aligned atoms and molecules in the gas phase. The calculations presented here are the first to demonstrate the experimental feasability of CDAD studie

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35

Hsu, sen-jail, and 許生杰. "The process of multiphoton ionization of Mg." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/92158625324202411702.

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36

Xu, Sheng-Jie, and 許生杰. "The process of multiphoton ionization of Mg." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/40420253532445659983.

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37

Rudolph, Henrik. "Dynamics of rotationally resolved multiphoton ionization processes in molecules." Thesis, 1989. https://thesis.library.caltech.edu/7947/1/Rudolph%201989.pdf.

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<p>This dissertation presents the results of studies of several rotationally- resolved resonance enhanced multiphoton ionization (REMPI) processes in some simple molecular systems. The objective of these studies is to quantitatively identify the underlying dynamics of this highly state-specific process which utilizes the narrow bandwidth radiation of a laser to ionize a molecule by first preparing an excited state via multiphoton absorption and subsequently ionizing that state before it can decay. Coupled with high-resolution photoelectron spectroscopy, REMPI is clearly an important pr

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38

de, Laat Richard. "Resonance Enhanced Multiphoton Ionization Studies of Dichlorotoluenses, Dichloroanilines, and Dichlorophenols." Thesis, 2012. http://hdl.handle.net/10214/5262.

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A new instrument using a time-of-flight (TOF) mass filter (MF) for resonance enhanced multiphoton ionization (REMPI) studies of gas phase molecules was developed. This instrument was designed to make use of the selectivity of the REMPI process and the sensitivity of a TOF-MF with a microchannel plate detector. A pulsed valve inlet system was tested to determine its effectiveness in “cooling” molecules but it was not used for the bulk of the studies performed. The instrument was tested using molecular and atomic bromine, atomic carbon, and atomic iodine. The atomic bromine, carbon, and iodine,

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39

Steinmann, Jochen [Verfasser]. "Multiphoton ionization of laser cooled lithium / presented by Jochen Steinmann." 2007. http://d-nb.info/985810742/34.

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40

Zimmerman, Jeffrey Alan. "Resonant and non-resonant multiphonon ionization studies of some anilines." 1989. http://catalog.hathitrust.org/api/volumes/oclc/27005894.html.

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41

YANG, CHANG-YING, and 楊長英. "Nonresonant multiphoton ionization processes of hydrogen atom in a laser field." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/45551287685109537015.

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42

Chen, Kuan-Hao, and 陳冠豪. "Comparison of ionization efficiency between femtosecond laser-induced multiphoton ionization (MPI) and electron impact ionization (EI) for the detection of human exhaled gases." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ph47b5.

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碩士<br>國立臺灣師範大學<br>化學系<br>107<br>Characteristic mass fragmentation of breathing gases from nonsmoker/smoker was investigated and compared by means of gas chromatography-electron ionization-mass spectrometry (GC-EI/MS) and femtosecond laser excited multiphoton ionization/time-of-flight mass spectrometry (FL-MPI/TOFM) methods, respectively. Solid phase microextraction (SPME) was used to improve the concentration levels. As a result, more than 40 types of volatile organic compounds (VOCs) in human breath were detected and 24 types of them were identified by database. The use of GC-EI/MS was usefu

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43

Hart, Nathan Andrew. "Intensity-resolved Above Threshold Ionization Yields of Atoms with Ultrashort Laser Pulses." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10202.

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The above threshold ionization (ATI) spectra provide a diversity of information about a laser-atom ionization process such as laser intensity, pulse duration, carrier envelope phase, and atomic energy level spacing. However, the spatial distribution of intensities inherent in all laser beams reduces the resolution of this information. This research focuses on recovering the intensity-resolved ATI spectra from experimental data using a deconvolution algorithm. Electron ionization yields of xenon were measured for a set of laser pulse intensities using a time of flight (TOF) setup. Horizontally

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44

Braunstein, Matthew. "Photoionization dynamics and ion state distributions in single-photon and resonance enhanced multiphoton ionization of molecules." Thesis, 1991. https://thesis.library.caltech.edu/2641/1/Braunstein_m_1991.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. This thesis presents results of theoretical studies of single-photon ionization and resonance enhanced multiphoton ionization (REMPI) of several small molecules. These studies parallel several recent experiments which use tunable sources of radiation to photoionize molecules and measure the resulting electronic, vibrational, and rotational population of ions via photoelectron spectroscopy. The objective of this thesis is to examine the underlying dynamics between the ion and the

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45

Yen, Hung-Ying, and 顏宏穎. "Simulation of the multiphoton ionization of Helium ion in two-color field with strong-field approximation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9n8cyz.

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碩士<br>國立交通大學<br>物理研究所<br>106<br>When strong laser field illuminate an atom or a molecule, will happen many interesting phenomena such as multiphoton ionization, tunneling ionization, etc. We can understand more about the structure of an atom and relating content through these different phenomena. In this thesis, we use the simulation method of strong-field approximation(SFA), though it is an approximate theory, the results are still qualitatively consistent with the calculation of the time-dependent schördinger equation. The main content of this thesis is about a linear polarized two-color las

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46

Requate, Arvid [Verfasser]. "S-matrix analysis of vibrational and alignment effects in intense field multiphoton ionization of molecules / Arvid Requate." 2007. http://d-nb.info/984912118/34.

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47

Ghosh, Arup Kumar. "A Time-of-Flight Mass Spectrometric Study of Multiphoton Dissociation and Ionization of Selected Atmospherically Important Compounds." Thesis, 2019. http://hdl.handle.net/10821/8198.

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The thesis is concerned with the dissociation and ionization dynamics of selected atmospherically significant volatile organic compounds. The primary objective is to investigate the various photochemical events that take place within these molecules upon multiphoton excitation in the ultraviolet region of the electromagnetic spectrum. The major process that takes place upon multiphoton excitation of molecules is ionization of the followed by its dissociation in to different fragments. However, many isomerization and rearrangement process can occur when the molecules are excited to the intermed

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48

Musa, Mohamed O. "A study of the dissociation dynamics of D₂O on zirconium surfaces using resonance enhanced multiphoton ionization spectroscopy." Thesis, 2006. http://hdl.handle.net/2429/18607.

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Atomic hydrogen adsorbates on Zr surfaces have much higher probability for dissolution into the bulk than recombinative desorption even when the surface is heated at rates as high as 10¹⁰ K/s. On the other hand, water dissociation on hot Zr surfaces (which takes place at temperatures as low as 80 K) produces molecular hydrogen very efficiently at temperatures above 230 K. To help resolve these apparently contradictory observations and to generally understand the dynamics of heavy water (D₂O) dissociation on Zr, we built an UHV chamber equipped with pressure and surface diagnostic tools to prob

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49

Wu, Ren-Jie, and 吳仁傑. "Calculation of the time-dependent Schro ̈dinger equation in momentum space and the study of atomic multiphoton ionization." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/13373770632358451015.

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碩士<br>國立交通大學<br>物理研究所<br>99<br>Quantum mechanical wave function in momentum space with generalized pseudospectral method, we can save the amount of computation and that the error are small, and the result can be obtained with more easily way. Then we can apply those complete set of wave functions to other theory, such as perturbation theory, strong field approximation (SFA), etc., providing a simple and fast calculation tool to determine the motion of photonelectron in a strong laser field.

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50

Pan, Hsuan-Yuan, and 潘宣元. "Using a homemade time of flight spectrometry to automatically implement resonance enhanced multiphoton ionization spectroscopy and time-resolved spectroscopy experiments." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/41272128868239338568.

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碩士<br>國立交通大學<br>應用化學系碩博士班<br>104<br>This thesis is consist of three main parts: 1.Bulid up a homemade time of flight (TOF) spectrometry. 2. Use abVIEW software to establish an automatic program. 3.Use the above instruments to measure the resonance-enhanced multiphoton ionization (REMPI) and pump-probe experiments. Part I: Build up a homemade TOF spectrometry with some special modules to improve the mass spectrometry resolution. By using Solidworks (a 3D CAD software) to simulate the process before assembly, we can prevent the instrument from interfering each other during assembly process. Pa

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