Dissertations / Theses on the topic 'Excited atoms'
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Roberts, Gareth. "Collisional processes of laser-excited alkaline earth atoms." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.346405.
Full textHiggins, Michael John. "The production and properties of highly excited xenon atoms." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335413.
Full textDu, K. "Transient intermediates in excited mercury vapour." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383164.
Full textBasu, Subhash Chandra. "Reactions of Si and Ge atoms with unsaturated organic molecules by time-resolved atomic resonance absorption spectroscopy." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293497.
Full textRalph, D. G. "Studies of reactions of excited oxygen atoms of atmospheric importance." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355794.
Full textAshbourn, Joanna Maria Antonia. "Kinetics of excited hydrogen-like atoms in high-temperature plasmas." Thesis, London South Bank University, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245066.
Full textJhumka, Sarah. "Super-elastic scattering from laser excited calcium and silver atoms." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/superelastic-scattering-from-laser-excited-calcium-and-silver-atoms(eef2bfaf-5c3d-4044-a751-d0f34073a8c7).html.
Full textKishimoto, Yasuhiro. "Stark structure and field ionization characteristics of highly excited Rydberg atoms." 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/149965.
Full textTopçu, Türker. "Time dependent studies of fundamental atomic processes in Rydberg atoms /." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Dissertations/TOPCU_TURKER_31.pdf.
Full textCarl, S. A. "Kinetic studies of alkali atoms and electronically excited calcium atoms in the gas phase by laser excitation methods." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339735.
Full textSang, Robert Thomas, and n/a. "Superelastic Electron Scattering from Laser Excited States of Sodium." Griffith University. School of Science, 1995. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050921.120911.
Full textBrown, Philip Robert. "Diode laser spectroscopy of molecular ions and excited atoms in alternative current discharges." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315821.
Full textAntrobus, Stephen. "Gas phase studies of electronically excited strontium and barium atoms by laser methods." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627480.
Full textBarnes, Peter William. "An investigation into the state selective chemistry of vibrationally excited water with hydrogen atoms." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369757.
Full textUeno, Keisuke. "A study of microho1low cathode discharge plasmas by laser absorption spectroscopy of excited helium atoms." Kyoto University, 2019. http://hdl.handle.net/2433/242494.
Full textWintermantel, Tobias Martin [Verfasser], and Matthias [Akademischer Betreuer] Weidemüller. "Complex systems dynamics in laser excited ensembles of Rydberg atoms / Tobias Martin Wintermantel ; Betreuer: Matthias Weidemüller." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1225938619/34.
Full textWintermantel, Tobias [Verfasser], and Matthias [Akademischer Betreuer] Weidemüller. "Complex systems dynamics in laser excited ensembles of Rydberg atoms / Tobias Martin Wintermantel ; Betreuer: Matthias Weidemüller." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1225938619/34.
Full textKabir, Mahbub. "Time-resolved kinetic studies of ground state carbon and electronically excited germanium atoms by resonance absorption spectroscopy." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627574.
Full textLei, Jie. "Time-resolved investigations of fundamental collisional processes of electronically excited strontium and barium atoms generated by laser excitation." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627316.
Full textShah, Mudessar H. "Model-independent measurement of the excited fraction in a magneto-optical trap(MOT)." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/235.
Full textKandappa, Sunil Kumar. "Light as a Reagent for Chemical Reactions-Excited State Manipulation to Discover New Reactivity." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1573830383912829.
Full textRadouani, Abdelhak. "Réaction des atomes métastables de gaz rares (Ar*(3p2,0), Kr*(3p2) et Xe*(3p2)) avec le silane." Grenoble 1, 1986. http://www.theses.fr/1986GRE10143.
Full textSanz, Mora Adrián [Verfasser], Jan-Michael [Akademischer Betreuer] Rost, Jan-Michael [Gutachter] Rost, Walter [Gutachter] Strunz, and Sebastian [Gutachter] Wüster. "Interfacing mechanical resonators with excited atoms / Adrián Sanz Mora ; Gutachter: Jan-Michael Rost, Walter Strunz, Sebastian Wüster ; Betreuer: Jan-Michael Rost." Dresden : Technische Universität Dresden, 2018. http://d-nb.info/1226813550/34.
Full textNúñez, Reyes Dianailys. "Astrochimie expérimentale : cinétique des réactions neutre-neutre à basse température et pertinence pour la chimie des atmosphères planétaires et des nuages interstellaires." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0032/document.
Full textThe last 50 years have been characterized by the fast development of astrochemistry as a science. To date, more than 150 gas-phase neutral-neutral reactions have been investigated at low temperatures relevant to planetary atmospheres and in cold regions of the interstellar medium. However, the rate constants and nature of the products for many potentially important gas-phase processes remain unknown. We performed kinetic studies of reactive and non-reactive removal processes between electronically excited atoms [C(1D), O(1D) and N(2D)] with several molecules in order to quantify their importance in the chemistry of planetary atmospheres. Furthermore, we also investigated the reaction between carbon atoms in their ground electronic state (3P) with water, providing new evidence of a quantum mechanical tunnelling mechanism at low temperatures, which could play an important role in the chemistry of interstellar clouds. Rate constants and branching ratios for these processes were determined over the 50 - 296 K temperature range using a CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) apparatus coupled with pulsed laser photolysis (PLP) and vacuum ultraviolet laser induced fluorescence (VUV LIF)
Quichaud, Viviane. "Etude des processus elementaires : de synthese de la molecule no, en post-decharge en ecoulement, de collisions titane-gaz rares, titane-molecules, par perturbation laser resolue en temps." Paris 6, 1987. http://www.theses.fr/1987PA066135.
Full textSAGE, FRANCOISE. "Pompage optique du niveau metastable **(3)p : :(o) de la premiere configuration excitee des isotopes impairs des gaz rares." Caen, 1985. http://www.theses.fr/1985CAEN2039.
Full textAstruc, Jean-Pierre. "Transfert d'électron entre atomes excités et molécules dans une expérience en jets croisés avec fluorescence résolue dans le temps." Paris 13, 1987. http://www.theses.fr/1987PA132020.
Full textZuliani, Alexandre. "Vers la manipulation optique d'atomes ultra-froids d'ytterbium excités dans des états de Rydberg." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS141/document.
Full textThe exacerbated properties of Rydberg atoms have extended the possibilities offered by cold atoms in creating atomic gases in very strong interaction with applications including quantum simulations in many-body physics or in achieving of quantum gates with the dipole blocking phenomenon. The use of cold Rydberg atoms is however currently limited by the fact that it is not possible to continue to apply the experimental techniques of optical manipulation with the atoms to an active electron. The attention of the Rydberg atoms cold community is recently focused on the two active electron atoms offering possibilities, once one of the two electrons excited to a Rydberg state, to provide a second optically active electron that it will be possible to manipulate with laser light.The objective of this thesis is to extend the optical manipulation techniques to atoms with two active electrons excited in Rydberg states, in the case of the ytterbium atom. It has on the one hand the design and assembly of the experimental apparatus for obtaining a source of cold Rydberg ytterbium atoms. Ultimately, this device will allow the optical manipulation of these Rydberg atoms. Furthermore, it presents the development of a numerical model that implements the multichannel quantum defect theory to the theoretical determination of the energy spectrum of ytterbium and its behavior under the influence of external perturbations
Fechner, Lutz [Verfasser], and Robert [Akademischer Betreuer] Moshammer. "High resolution experiments on strong-field ionization of atoms and molecules: test of tunneling theory, the role of doubly excited states, and channel-selective electron spectra / Lutz Fechner ; Betreuer: Robert Moshammer." Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180033167/34.
Full textHliwa, Mohamed. "Traitement simplifie des interactions moleculaires en chimie quantique." Toulouse 3, 1988. http://www.theses.fr/1988TOU30038.
Full textBensitel, Abdeslam. "Spectroscopie des ions de recul d'argon produits par impact d'ions lourds dans le domaine 90-850a." Caen, 1988. http://www.theses.fr/1988CAEN2003.
Full textMercier-Depuydt, Eliane. "Contribution a l'etude des collisions ion-atome a basse energie : un modele semi-diabatique pour les courbes de potentiel des ions moleculaires arh**(+*) et hene**(+*)." Paris 6, 1987. http://www.theses.fr/1987PA066522.
Full textRouvellou, Bruno. "Photoionisation des atomes excites et des ions." Paris 7, 1994. http://www.theses.fr/1994PA077295.
Full textHami, Mohamed. "Spectroscopie du mélange helium-xénon : rôle du monoxyde de carbone : analyse cinétique dans l'ultra-violet lointain." Toulouse 3, 1988. http://www.theses.fr/1988TOU30169.
Full textMcLaughlin, Thomas Kevin. "Excited state formation in slow multiply-charged ion-atom collisions." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317515.
Full textJaïdane, Nejmeddine. "Etude du transfert de charge entre des atomes de soufre et des protons." Paris 7, 1987. http://www.theses.fr/1987PA077121.
Full textMagnier, Sylvie. "Détermination des états électroniques excités des molécules Na#2 ET K#2 : application aux collisions entre atomes excités par laser." Paris 11, 1993. http://www.theses.fr/1993PA112224.
Full textPinsker, Florian. "Excitations in superfluids of atoms and polaritons." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/246469.
Full textMartin, Marion. "Reaction of chlorine atom with methane excited to the second stretching overtone /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Full textGeng, Ting. "Excited-state dynamics of small organic molecules studied by time-resolved photoelectron spectroscopy." Doctoral thesis, Stockholms universitet, Fysikum, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-140482.
Full textAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Manuscript. Paper 6: Manuscript.
Féron, Patrice. "Étude par des techniques de jets croisés et d'analyse laser de collisions aux énergies thermiques entre atomes métastables (Ne*, He*) et atomes (Ne, He, Ar) ou molécules (N₂, O₂, NO) à l'état fondamental." Paris 11, 1988. http://www.theses.fr/1988PA112281.
Full textBrites, Vincent. "Détermination ab initio de potentiels électroniques pour le calcul de données spectroscopiques." Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST1052.
Full textHighly correlated ab initio methodologies were used to investigate the structure and the spectroscopy of small and medium sized molecules at different levels of theory. Our results are compared to the available experimental data. For the AlCl molecule, our computed spectroscopic constants were in good agreement with the experimental ones, allowing us to predict a set of predictive data for the less known AlCl+ and AlCl2+ ions. After that, we treated the predissociation lifetimes of the A state of SH and SH+. Our highly correlated calculations allowed us to reproduce the lifetimes measured experimentally. Thereafter, multidimensional potential energy surfaces of the ground state of N2H+, N2H2+ and N2HAr+ were generated. These surfaces were used for the calculations of rovibrational levels of these ions and their respective deuterated species. An overall excellent agreement was obtained comparing to the available experimental measurements. Finall y, we investigated the Si(C2H3)4 molecule in order to establish a methodology for the treatment of the structure and electronic excited states of medium sized molecules. We also studied the reactivity of the Si(C2H3)4+ ion for a tentative assignment of the mass spectra obtained in the University of Bratislava by an electron impact experiment
Henriet-Scavennec, Anne. "Etude theorique des etats excites de na#2; application au traitement de l'ionisation associative entre atomes de sodium excites." Paris 11, 1988. http://www.theses.fr/1988PA112424.
Full textTaoutioui, Abdelmalek. "Étude théorique de la dynamique électronique au cours de collisions entre des ions et des cibles atomiques hautement excitées." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS323.
Full textThe understanding of the electronic processes taking place during atomic collisions is of great interest for the modeling of phenomena observed in complex systems such as atmospheric, astrophysical and biological environments. These processes manifest at the microscopic level but play a determining role on the evolution and the physicochemical properties of these macroscopic systems. From a fundamental point of view, collisions are also privileged "laboratories" for the study of quantum systems with N-bodies. Ion-atom collisions are of crucial importance in several fields such as that concerning nuclear fusion by magnetic confinement: the understanding of the electronic processes is necessary for the modeling of this type of plasmas. This thesis is situated in this context and is dedicated to the theoretical study of the electronic processes that occur during collisions between ions and highly excited atomic targets. In this work, we privileged the modeling of the electronic capture and the computation of the cross sections for the proton-hydrogen system. We adopted two non-perturbative theoretical approaches: the classical CTMC method and a semi-classical SCAOCC method. We calculated the total and partial capture cross sections for targets initially excited up to the n = 7 layer. Comparisons between the results of these methods and the few theoretical data available are made and represent the originality of the work. Empirical scale laws for total cross sections are also described
Scielzo, Nicholas David. "Measurement of the beta-neutrino correlation in laser trapped {sup 21}Na." Berkeley, Calif. : Oak Ridge, Tenn. : Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/821455-YDxgQ2/native/.
Full textPublished through the Information Bridge: DOE Scientific and Technical Information. "LBNL--54350" Scielzo, Nicholas David. USDOE Director. Office of Science. Nuclear Physics (US) 06/01/2003. Report is also available in paper and microfiche from NTIS.
Terrabuio, Luiz Alberto. "Novas investigações de propriedades elétricas realizadas por meio da teoria quântica de átomos em moléculas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-25102017-150506/.
Full textIn this PhD thesis we present the results of four different topics that refer to a study of electric properties interpreted with The Quantum Theory of Atoms and Molecules (QTAIM). First, dipole moments and their derivatives were calculated from a new formalism based on Ehrenfest Force Fields (EFF) and a comparison with data from QTAIM is carried out. Therefore, the Charge-Charge Flux-Dipole Flux (CCFDF) model was discussed for the dipole moment derivatives. The results from EFF were satisfactory in quantitative terms although QTAIM still seems to be better for the description of atomic polarization and its variations during vibrations. In the sequence, we investigated the Non-Nuclear Attractors (NNAs) that could be identified with the QTAIM formalism. Our intention was to discover new molecules that present this peculiarity, as well as to find trends among these cases that allow contributing for the understanding of the factors that lead to their appearance. For this purpose, we selected homonuclear diatomic molecules of elements presenting atomic numbers ranging from Z=1 to Z=38 and heteronuclear diatomic molecules containing these same elements. Our data shows that NNAs could be found in almost every homonuclear molecule expect by the systems formed by Hydrogen, Helium, and Strontium. On other hand, we have found 30 cases of NNAs in heteronuclear molecules, many of them seen for the first time. We also have noticed that the atomic polarizabilities play a main role in the understanding of these cases. We also treated molecules containing weak Van der Waals interactions (triatomic complexes presenting a noble gas bonded to a diatomic ionic molecule) in order to investigate the atomic dipole values obtained with QTAIM in a direct way, that is, by means of a comparison using a simple model for this kind of bonding. Finally, we studied molecules in excited states. Our focus was in two peculiar cases (CO and CF2N2), which present null dipole moments in their ground states but exhibit significant dipole moment values in their first excited states. Therefore, QTAIM was fundamental to understand how the excitation process can lead to important changes in electric properties.
Leonhardt, Karsten. "Interplay of excitation transport and atomic motion in flexible Rydberg aggregates." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-213759.
Full textLight, C. E. "A study of spectral line intensities and excited atom populations in a hollow cathode discharge." Thesis, London Metropolitan University, 1988. http://repository.londonmet.ac.uk/3032/.
Full textGorceix, Olivier. "Effet du terme de breit complet sur les niveaux d'energie des atomes : applications au cas des ions lourds heliumoides." Paris 6, 1987. http://www.theses.fr/1987PA066403.
Full textKelly, Nicholas Christoper. "The dynamics of an excited hydrogen atom in a parallel low frequency microwave and static field." Thesis, Open University, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.530488.
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