Etude théorique de l'excitation d'ions et d'atomes par collision avec des noyaux nus aux vitesses intermédiaires PDF Download
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Author: Bernard Brendle
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Author: Bernard Brendle
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Author: Bilel Zarour
Publisher:
ISBN:
Category :
Languages : fr
Pages : 141
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Les processus d'échange de charge et d'excitation sont bien connus dans les collisions atomiques. Le but de cette thèse est d'étudier ces processus dans les collisions avec les agrégats, qui sont jusque là mal connus. Les vitesses de collisions sont assez faibles pour pouvoir appliquer la méthode moléculaire. La résolution de l'équation de Schrödmger pour un grand nombre d'électron est impossible. Pour surmonter cette difficulté, nous avons utilise le modèle à électrons indépendants. Dans l'expérience, on ne peut connaître que la configuration finale de quelques électrons. Le formalisme adéquate pour décrire cette situation est le formalisme des probabilités inclusive que nous avons utilisé pour calculer les sections efficaces d'échange de charge et d'excitation. Dans le cas des collisions atome - agrégats de sodium, nous avons comparé avec les expériences du laboratoire d' Aimé Cotton à Orsay et nous avons trouvé un bon accord. Ceci a confirmé la validité de notre modèle théorique
Author: Mammar Bouamoud
Publisher:
ISBN:
Category :
Languages : fr
Pages : 360
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DEVELOPPEMENT D'UNE METHODE VARIATIONNELLE FONDEE SUR LE PRINCIPE DE SCHWINGER, BIEN ADAPTEE POUR LE CALCUL DE L'EXCITATION ELECTRONIQUE D'ATOMES OU IONS PAR DES IONS MUS. APPLICATION A LA DETERMINATION DES SECTIONS EFFICACES TOTALES D'EXCITATION DES NIVEAUX N=2 ET 3 DE H PAR IMPACT DE PROTONS (8,55-200 KEV). ETUDE DE L'EXCITATION DE XE**(52+)(1S**(2)) ENVOYES DANS UN MONOCRISTAL DE SI EN CONDITIONS DE CANALISATION OU NON; PAR CETTE METHODE, ANALYSE DE L'EVOLUTION DE LA SATURATION DES SECTIONS EFFICACES TOTALES D'EXCITATION DES NIVEAUX (1S,NL) OU N = 2,3 ET L = 0,1 DES IONS FE**(24+) (1S**(2)) A 400 MEV ET XE**(52+) (1S**(2)) A 25 MEV, ENVOYES SUR DES NOYAUX DE CHARGES COMPRISES ENTRE 1 ET 36. COMPARAISON DES APPROXIMATIONS DE BORN AUX 1ER ET 2EME ORDRE, DES APPROCHES VARIATIONNELLES
Author: Françoise Masnou-Seeuws
Publisher:
ISBN:
Category :
Languages : fr
Pages : 44
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Etude générale de la collision atome-atome lorsque le couplage spin-orbite n'est pas négligeable, et à l’application au système sodium-hélium: hypothèses sur la trajectoire et le potentiel, résolution du système d'équations couplées. L'interaction prédominante entre les deux atomes est l'interaction répulsive a moyenne portée. Explication du mécanisme de collision lorsque varie la distance entre atomes. Généralisation de l'étude a l'excitation de transitions de structure fine d'ions positifs de configuration p (FeXIV) et p2(NII, OIII, SiIX, FeXIII) par impact protonique.
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Author: J. Belle
Publisher:
ISBN:
Category : Nuclear fuels
Languages : en
Pages : 146
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Author: Jacques Lafontaine
Publisher: Springer
ISBN: 3319207350
Category : Mathematics
Languages : en
Pages : 408
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Book Description
This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Author: P. M. Banks
Publisher: Elsevier
ISBN: 1483260666
Category : Science
Languages : en
Pages : 445
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Book Description
Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.
Author: Jean-Paul Blaizot
Publisher: Mit Press
ISBN: 9780262022149
Category : Science
Languages : en
Pages : 657
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This book provides a comprehensive and pedagogical account of the various methods used in the quantum theory of finite systems, including molecular, atomic, nuclear, and particle phenomena. Covering both background material and advanced topics and including nearly 200 problems, Quantum Theory of Finite Systems has been designed to serve primarily as a text and will also prove useful as a reference in research. The first of the book's four parts introduces the basic mathematical apparatus: second quantization, canonical transformations, Wick theorems and the resulting diagram expansions, and oscillator models. The second part presents mean field approximations and the recently developed path integral methods for the quantization of collective modes. Part three develops perturbation theory in terms of both time-dependent Feynman diagrams and time-independent Goldstone diagrams. A fourth part discusses variational methods based on correlated wavefunctions, including spin correlations. The approximation schemes are formulated for fermions and bosons at eigher zero or non-zero temperature. Although the formalism developed applies to both finite and infinite systems, the book stresses those aspects of the theory that are specific to the description of finite systems. Thus special attention is given to mean field approximations, the ensuing broken symmetries, and the associated collective motions such as rotations. Conversely, some specific features of systems with infinite numbers of degrees of freedom (such as the thermodynamic limit, critical phenomena, and the elimination of ultraviolet divergencies) are deliberately omitted. Jean-Paul Blaizot and Georges Ripka are associated with the Centre d'Etudes Nucleaires de Saclay.
Author: Sir John Townsend
Publisher:
ISBN:
Category : Electric conductivity
Languages : en
Pages : 112
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