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Etude Theorique Et Experimentale Des Collisions Entre Atomes De Rydberg Et Cibles Neutres Atomique Ou Moleculaire A Energie Thermique
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Book Synopsis ETUDE THEORIQUE ET EXPERIMENTALE DES COLLISIONS ENTRE ATOMES DE RYDBERG ET CIBLES NEUTRES (ATOMIQUE OU MOLECULAIRE) A ENERGIE THERMIQUE by : LUC.. PETITJEAN
Download or read book ETUDE THEORIQUE ET EXPERIMENTALE DES COLLISIONS ENTRE ATOMES DE RYDBERG ET CIBLES NEUTRES (ATOMIQUE OU MOLECULAIRE) A ENERGIE THERMIQUE written by LUC.. PETITJEAN and published by . This book was released on 1985 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: DESCRIPTION DE CES COLLISIONS PAR L'APPROXIMATION D'IMPACT AFIN D'EVALUER LE FACTEUR DE FORME DE LA TRANSITION ATOMIQUE, PUIS LES SECTIONS EFFICACES. COMPARAISON AUX DONNEES EXPERIMENTALES DE DEPEUPLEMENT TOTAL D'ETATS DE RYDBERG DE RB PAR DES PERTURBATEURS MOLECULAIRES (N::(2), CO, NH::(3), ND::(3)). INFLUENCE DES MOMENTS MULTIPOLAIRES DE LA MOLECULE, DU DEFAUT D'ENERGIE DE LA REACTION, ETC. ATTRIBUTION DU DEPEUPLEMENT TOTAL A UN TRANSFERT D'ENERGIE QUASI RESONNANT. EXTENSION DE L'APPROCHE THEORIQUE A DES ETATS MOINS EXCITES
Book Synopsis Etude théorique et expérimentale des collisions entre atomes de Rydberg et cibles neutres(atomique ou moléculaire) à énergie thermique by : Luc Petitjean
Download or read book Etude théorique et expérimentale des collisions entre atomes de Rydberg et cibles neutres(atomique ou moléculaire) à énergie thermique written by Luc Petitjean and published by . This book was released on 1985 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Étude théorique et expérimentale des collisions entre atomes de Rydberg et cibles neutres (atomique ou moléculaire) à energie by : Luc Petitjean
Download or read book Étude théorique et expérimentale des collisions entre atomes de Rydberg et cibles neutres (atomique ou moléculaire) à energie written by Luc Petitjean and published by . This book was released on 1985 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Richard Barry Bernstein Publisher :Springer Science & Business Media ISBN 13 :1461329132 Total Pages :785 pages Book Rating :4.4/5 (613 download)
Book Synopsis Atom - Molecule Collision Theory by : Richard Barry Bernstein
Download or read book Atom - Molecule Collision Theory written by Richard Barry Bernstein and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 785 pages. Available in PDF, EPUB and Kindle. Book excerpt: The broad field of molecular collisions is one of considerable current interest, one in which there is a great deal of research activity, both experi mental and theoretical. This is probably because elastic, inelastic, and reactive intermolecular collisions are of central importance in many of the fundamental processes of chemistry and physics. One small area of this field, namely atom-molecule collisions, is now beginning to be "understood" from first principles. Although the more general subject of the collisions of polyatomic molecules is of great im portance and intrinsic interest, it is still too complex from the viewpoint of theoretical understanding. However, for atoms and simple molecules the essential theory is well developed, and computational methods are sufficiently advanced that calculations can now be favorably compared with experimental results. This "coming together" of the subject (and, incidentally, of physicists and chemists !), though still in an early stage, signals that the time is ripe for an appraisal and review of the theoretical basis of atom-molecule collisions. It is especially important for the experimentalist in the field to have a working knowledge of the theory and computational methods required to describe the experimentally observable behavior of the system. By now many of the alternative theoretical approaches and computational procedures have been tested and intercompared. More-or-Iess optimal methods for dealing with each aspect are emerging. In many cases working equations, even schematic algorithms, have been developed, with assumptions and caveats delineated.
Book Synopsis Introduction to the Theory of Collisions of Electrons with Atoms and Molecules by : Satya P. Khare
Download or read book Introduction to the Theory of Collisions of Electrons with Atoms and Molecules written by Satya P. Khare and published by Springer Science & Business Media. This book was released on 2002 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: An understanding of the collisions between micro particles is of great importance for the number of fields belonging to physics, chemistry, astrophysics, biophysics etc. The present book, a theory for electron-atom and molecule collisions is developed using non-relativistic quantum mechanics in a systematic and lucid manner. The scattering theory is an essential part of the quantum mechanics course of all universities. During the last 30 years, the author has lectured on the topics presented in this book (collisions physics, photon-atom collisions, electron-atom and electron-molecule collisions, "electron-photon delayed coincidence technique", etc.) at many institutions including Wayne State University, Detroit, MI, The University of Western Ontario, Canada, and The Meerut University, India. The present book is the outcome of those lectures and is written to serve as a textbook for post-graduate and pre-PhD students and as a reference book for researchers.
Author :Vsevolod V. Balashov Publisher :Springer Science & Business Media ISBN 13 :9780306462665 Total Pages :258 pages Book Rating :4.4/5 (626 download)
Book Synopsis Polarization and Correlation Phenomena in Atomic Collisions by : Vsevolod V. Balashov
Download or read book Polarization and Correlation Phenomena in Atomic Collisions written by Vsevolod V. Balashov and published by Springer Science & Business Media. This book was released on 2000-04-30 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The book provides a concise description of the density matrix and statistical tensor formalism and presents a general approach to the description of angular correlation and polarization phenomena. It illustrate an application of the angular momentum technique to a broad variety of atomic processes.".
Book Synopsis Atom - Molecule Collision Theory by : Richard Barry Bernstein
Download or read book Atom - Molecule Collision Theory written by Richard Barry Bernstein and published by Springer. This book was released on 2013-06-14 with total page 779 pages. Available in PDF, EPUB and Kindle. Book excerpt: The broad field of molecular collisions is one of considerable current interest, one in which there is a great deal of research activity, both experi mental and theoretical. This is probably because elastic, inelastic, and reactive intermolecular collisions are of central importance in many of the fundamental processes of chemistry and physics. One small area of this field, namely atom-molecule collisions, is now beginning to be "understood" from first principles. Although the more general subject of the collisions of polyatomic molecules is of great im portance and intrinsic interest, it is still too complex from the viewpoint of theoretical understanding. However, for atoms and simple molecules the essential theory is well developed, and computational methods are sufficiently advanced that calculations can now be favorably compared with experimental results. This "coming together" of the subject (and, incidentally, of physicists and chemists !), though still in an early stage, signals that the time is ripe for an appraisal and review of the theoretical basis of atom-molecule collisions. It is especially important for the experimentalist in the field to have a working knowledge of the theory and computational methods required to describe the experimentally observable behavior of the system. By now many of the alternative theoretical approaches and computational procedures have been tested and intercompared. More-or-Iess optimal methods for dealing with each aspect are emerging. In many cases working equations, even schematic algorithms, have been developed, with assumptions and caveats delineated.
Book Synopsis Collision Dynamics of Rydberg Atoms and Molecules at Ultralow Energies by :
Download or read book Collision Dynamics of Rydberg Atoms and Molecules at Ultralow Energies written by and published by . This book was released on 2005 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Major Highlight: Collisional Stark Mixing at ultralow energies in Rydberg Plasmas. Atoms in high (n, l) states formed in cold Rydberg plasmas decay to the ground state in a succession of radiative transitions populating intermediate excited states. Which states are populated during cascading and with what probability can be obtained from known transition probabilities. Classical models simplify the calculation considerably, revealing the "trajectory" in nt space followed during the cascade, scaling rules and other aspects hidden within the quantal approach. Conserved Quantity (quantal analogue obscure): Quantal-Classical correspondence in radiative recombination and decay is directly demonstrated. Classical transition probabilities and radiative, recombination cross-section are in excellent agreement with quantal results. Cross section for three body collisional capture is formulated for arbitrary electron-energy distributions.
Book Synopsis CONTRIBUTION A L'ETUDE THEORIQUE DES COLLISIONS ENTRE UN ATOME TRES EXCITE ET UNE PARTICULE NEUTRE (ATOME OU MOLECULE) by : EUGENE.. DE PRUNELE
Download or read book CONTRIBUTION A L'ETUDE THEORIQUE DES COLLISIONS ENTRE UN ATOME TRES EXCITE ET UNE PARTICULE NEUTRE (ATOME OU MOLECULE) written by EUGENE.. DE PRUNELE and published by . This book was released on 1979 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: ANALYSE ET DISCUSSION DES PRINCIPALES APPROCHES THEORIQUES CONCERNANT LES COLLISIONS ENTRE ATOMES DE RYDBERG ET PARTICULES NEUTRES; ETUDE D'IMPLICATIONS IMPORTANTES DES HYPOTHESES FAITES, PAR EXEMPLE DANS LES TRANSFERTS D'ENERGIE EXTREMAUX SELON LA THEORIE DE FLANNERY. PROPOSITION D'UN MODELE SEMI-CLASSIQUE POUR CALCULER LA SECTION EFFICACE TOTALE DE DIFFUSION ENTRE UN ATOME DE RYDBERG A ET UNE PARTICULE NEUTRE B DANS L'HYPOTHESE QUE L'INTERACTION E-B EST A TRES COURTE PORTEE PAR RAPPORT AU RAYON MOYEN DE A. EXPRESSION DE LA PROBABILITE DE COLLISION EN FONCTION DE LA DENSITE DE PROBABILITE DE PRESENCE DE L'ELECTRON ET DE LA SECTION EFFICACE DE DIFFUSION ELECTRON LIBRE-B. ESTIMATION DE LA SECTION EFFICACE DE DIFFUSION ELASTIQUE ET COMPARAISON AUX EXPERIENCES DE DEPOPULATION COLLISION-NULLE TOTALE DE A. EN APPENDICES, 1) ETUDE DES VALEURS MOYENNES ET DISTRIBUTIONS DES VITESSES D'UN ELECTRON DE RYDBERG, ET 2) APPLICATION DU PRINCIPE DE CORRESPONDANTE AUX ETATS DE RYDBERG
Book Synopsis Introduction to the Theory of Atomic and Molecular Collisions by : John N. Murrell
Download or read book Introduction to the Theory of Atomic and Molecular Collisions written by John N. Murrell and published by . This book was released on 1989-09-04 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introduction to the scattering theory of low energy (0.1 to 1.0 eV) atomic and molecular collisions provides a strong theoretical background, maintaining a balance between classical and quantum approaches. Addresses the four main branches of the subject--elastic, inelastic and reactive scattering, and electron excitation--all supported by computational techniques.
Book Synopsis Atomic and Molecular Collisions by : Sir Harrie Stewart Wilson Massey
Download or read book Atomic and Molecular Collisions written by Sir Harrie Stewart Wilson Massey and published by Taylor & Francis Group. This book was released on 1979 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Few and Many-body Physics in cold Rydberg gases by : Paul Huillery
Download or read book Few and Many-body Physics in cold Rydberg gases written by Paul Huillery and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Au cours de cette thèse, la physique des systèmes en interaction à été étudié expérimentalement à partir de gaz froids d'atomes de Rydberg. Les atomes de Rydberg sont des atomes dans un état fortement excités et ils ont la propriété d'interagir fortement du fait d'interactions électrostatiques à longue portée. Le premier résultat majeur de cette thèse est l'observation expérimentale d'un processus à quatre corps. Ce processus consiste en l'échange d'énergie interne entre quatre atomes de Rydberg induit par leurs interactions mutuelles. Il a été possible, en plus de son observation expérimentale, de décrire théoriquement ce processus, au niveau quantique. L'excitation par laser des gaz d'atomes de Rydberg en forte interaction a aussi été étudiée durant cette thèse. Cette situation donne lieu à de très intéressants comportements à N-corps. Ce sujet d'intérêt fondamental pourrait aussi amener à d'éventuelles applications pour la réalisation de simulateurs quantiques ou de sources de lumière non classiques. Un second résultat majeur de cette thèse est l'observation expérimentale d'une statistique fortement sub-poissonienne, i.e corrélée de l'excitation Rydberg. Ce résultat confirme le caractère à N-corps de tels systèmes. Le troisième résultat majeur de cette thèse est le développement d'un modèle théorique pour l'excitation par laser des gaz d'atomes de Rydberg en forte interaction. En utilisant les états quantiques dit états collectifs de Dicke, il a été possible de mettre au jour de nouveaux mécanismes liés au comportement à N-corps de ces sytèmes atomiques en forte interaction.
Book Synopsis Atomic and Molecular Collision Theory by : Franco A. Gianturco
Download or read book Atomic and Molecular Collision Theory written by Franco A. Gianturco and published by Springer. This book was released on 2011-11-12 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until recently, the field of atomic and molecular collisions was left to a handful of practitioners who essentially explored it as a branch of atomic physics and gathered their experimental re sults mainly from spectroscopy measurements in bulk. But in the past ten years or so, all of this has dramatically changed, and we are now witnessing the rapid growth of a large body of research that encompasses the simplest atoms as well as the largest mole cules, that looks at a wide variety of phenomena well outside purely spectroscopic observation, and that finds applications in an unexpectedly broad range of physico-chemical and physical pro cesses. The latter are in turn surprisingly close to very important sectors of applied research, such as the modeling of molecular lasers, the study of isotope separation techniques, and the energy losses in confined plasmas, to mention just a few of them. As a consequence of this healthy state of affairs, greatly diversified research pathways have developed; however, their specialized problems are increasingly at risk of being viewed in isolation, although they are part of a major and extended branch of physics or chemistry. This is particularly true when it comes to the theory of this work -- where well-established methods and models of one subfield are practically unknown to researchers in other subfields -- and, consequently, the danger of wasteful duplication arising is quite real.
Book Synopsis CONTRIBUTIONS A L'ETUDE DES COLLISIONS ET DES INTERACTIONS DANS UN GAZ FROID D'ATOMES DE RYDBERG DE CESIUM by : PATRICK.. NOSBAUM
Download or read book CONTRIBUTIONS A L'ETUDE DES COLLISIONS ET DES INTERACTIONS DANS UN GAZ FROID D'ATOMES DE RYDBERG DE CESIUM written by PATRICK.. NOSBAUM and published by . This book was released on 1996 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE BUT DE CETTE THESE CONSISTE EN L'ETUDE DE PHENOMENES DE COLLISIONS ET LA MISE EN EVIDENCE D'EFFETS COLLECTIFS ENTRE ATOMES REFROIDIS PAR LASER. ELLE EST DIVISEE EN TROIS PARTIES DISTINCTES: POUR POUVOIR OBSERVER DES COLLISIONS ENTRE ATOMES FROIDS, IL EST NECESSAIRE DE METTRE EN PLACE DES DISPOSITIFS LIVRANTS DES ECHANTILLONS D'ATOMES FROIDS DENSES. UNE PREMIERE PARTIE S'OCCUPE DES EXPERIENCES DE MISE EN PLACE ET D'AMELIORATION D'UN PIEGE MAGNETO-OPTIQUE A DEUX DIMENSIONS. AVEC UN TEL DISPOSITIF, ON A ETE CAPABLE DE COMPRIMER DES JETS RALENTIS SUR UN DIAMETRE DE 200 MICROMETRES, TOUT EN AUGMENTANT LA DENSITE D'UN FACTEUR 300. DESIRANT CONNAITRE LE COMPORTEMENT D'ATOMES DE RYDBERG EN PRESENCE DE CHAMPS ELECTRIQUES EXTERNES, ON A ENTREPRIS DES EXPERIENCES SPECTROSCOPIQUES DE CROISEMENTS EVITES ENTRE ETATS STARK DU CESIUM. LE DEVELOPPEMENT D'UNE NOUVELLE METHODE PROFITANT DE LA DEPENDANCE DU CHEMIN D'IONISATION SUR LES CROISEMENTS EVITES A PERMIS DE LES CARACTERISER JUSQU'A DES LARGEURS DE 30 MHZ. LA TROISIEME PARTIE DE CETTE THESE DETAILLE LES EXPERIENCES DE COLLISIONS RESONNANTES ENTRE ATOMES DE RYDBERG QUI ONT ETE REALISEES SUR DES ATOMES DE CESIUM D'UN JET THERMIQUE ET D'UN PIEGE MAGNETO-OPTIQUE A TROIS DIMENSIONS. EN EXAMINANT LES RESULTATS OBTENUS, ON OBSERVE UNE NETTE DIFFERENCE ENTRE CES DEUX REGIMES DE COLLISIONS. LES COLLISIONS THERMIQUES SONT CORRECTEMENT DECRITES EN TANT QUE PROCESSUS DE COLLISION ENTRE DEUX ATOMES ISOLES, PRESENTANT UNE SECTION EFFICACE ET UNE VITESSE DE COLLISION. DANS LE CAS D'ATOMES ULTRA-FROIDS, LA VITESSE DE COLLISION DEVIENT NULLE ET LE TEMPS DE COLLISION EXCEDE LA DUREE DE VIE DES ATOMES DE RYDBERG IMPLIQUES. CEUX-CI VOIENT UNE INTERACTION CONSTANTE QUI DEPEND DU NOMBRE ET DE LA DENSITE DE PARTENAIRES DE COLLISION. ON ASSISTE AINSI A DES EFFETS COLLECTIFS ENTRE ATOMES DE RYDBERG QUI SONT FIGES DANS UNE SORTE DE GAZ GELE OU DE CRISTAL DESORDONNE
Book Synopsis Theoretical Atomic Collision Physics by :
Download or read book Theoretical Atomic Collision Physics written by and published by . This book was released on 1992 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current focus of the research is low-energy (collision v“bound v{sub e}) inelastic collisions for selected systems that possess the characteristic that many intermediate states are strongly coupled, such as can occur in classes of excited-atom (including Rydberg atom) collisions with atoms, molecules and positive and negative ions: (1) We are interested in the dependence of various differential and total cross sections on the angular momentum of the initial excited state and on the alignment of the initial electron charge distribution (for non-spherical initially excited states). (2) We wish to understand how characteristics of the classical trajectories (in CTMC calculations), e.g. multiple encounters, quasi-periodicity, chaos, relate to characteristics of the probability (scattering) amplitudes obtained from semiclassical (quantum mechanical) treatments. (3) In particular, in order to investigate a range of interaction regimes, '' we have proposed to study low-Rydberg-atom collisions with: ions and polar molecules (long range interaction); non-polar molecules and atoms (short-range interaction); as well as electron-attaching atoms/molecules (transient electron capture possible). (4) We plan to look for observable signatures of possibly novel intracollisional interference effects and quasi-vibrational resonance effects that may occur in low-Rydberg collisions.
Book Synopsis Etude théorique de processus multi-électroniques au cours de collisions atomiques et moléculaires by : Gabriel Labaigt
Download or read book Etude théorique de processus multi-électroniques au cours de collisions atomiques et moléculaires written by Gabriel Labaigt and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: De façon générale, la physique des collisions concerne l'étude des phénomènes induits par l'interaction de particules en mouvement. En physicochimie moléculaire et en physique atomique, cadres dans lesquels s'inscrit cette thèse, les interactions mises en jeu sont coulombiennes et les partenaires de la collision sont des espèces atomiques ou moléculaires, neutres ou chargées. Celles-ci sont susceptibles de subir au cours de la collision des modifications importantes de leur cortège électronique, à la source même de processus secondaires variés présentant un grand intérêt, par exemple, dans la modélisation de systèmes complexes tels que les plasmas, les milieux astrophysiques ou biologiques. Notre étude s'appuie sur une description théorique semi-classique non-perturbative des processus multi-électroniques au cours de collisions atomiques et moléculaires, à des énergies telles que la vitesse relative des partenaires est comparable à celle de leur électrons de valence. Dans deux systèmes " benchmark " (H+ - Li , He - H2+), nous avons mis en évidence respectivement l'existence de couplages complexes entre voies de réaction impliquant les électrons internes et de valence du lithium et des phénomènes d'interférences et de diffraction d'ondes de matière. Nous avons également étudié des systèmes de collision plus complexes impliquant le carbone, en analysant tout particulièrement des phénomènes multi-électroniques (collisions C(+) - He) - hors approximation des électrons indépendants - et multi-centriques (collisions proton-graphène). Pour ce dernier système, les résultats obtenus ont permis de mettre en évidence les principes d'une nouvelle technique d'imagerie de matériaux 2D.
Book Synopsis Etude théorique des processus électroniques ayant lieu au cours de collisions atomiques et moléculaires by : Hicham Agueny
Download or read book Etude théorique des processus électroniques ayant lieu au cours de collisions atomiques et moléculaires written by Hicham Agueny and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deux domaines différents de la physique des collisions ont fait l'objet de mes travaux de thèse réalisés dans le cadre d'une cotutelle entre l'Université Moulay Ismail, Meknes-Maroc et l'Université Pierre et Marie Curie, Paris-France: le premier concerne les collisions ion-atome/molécule dans le régime des énergies intermédiaires (keV), alors que le second vise le domaine des collisions électron-atome assistées par un champ laser intense. Bien que distincts, les deux thèmes sont interconnectés puisqu'il s'agit principalement d'étudier, dans des approches non-perturbatives, les phénomènes de diffusion et la dynamique électronique des collisions de cibles atomiques et moléculaires soumis à de fortes et très courtes perturbations. La première partie porte spécifiquement sur la modélisation des processus de transfert électronique et d'ionisation induits lors de collisions d'ions et de cibles atomiques et moléculaires. L'étude porte particulièrement sur les phénomènes d'interférences de type Young, de multi-diffusion et de diffraction Fraunhofer observés au cours de ces processus. La deuxième partie de thèse repose sur une étude des processus de diffusion élastiques et inélastiques induits lors de collisions assistées par un champ laser intense. L'étude s'appuie sur l'analyse spécifique des transitions "libre-libre" au cours lesquelles la cible reste dans son état fondamental après la collision, et des phénomènes de résonance dans le processus d'excitation simultanée électron-photon de la cible.
