Etude des sections efficaces partielles de photoionisation de quelques molécules simples dans le domaine d'énergie 10 à 35 eV obtenus a partir du rayonnement synchrotron PDF Download
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Author: A. Tabche-Fouhaile
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: A. Tabche-Fouhaile
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author: A. Tabche-Fouhaile
Publisher:
ISBN:
Category :
Languages : fr
Pages : 213
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Book Description
ETUDE DETAILLEE DES STRUCTURES D'AUTOIONISATION DE MOLECULES DIATOMIQUES; INTERPRETATION DE LA PARTIE CONTINUE DES SECTIONS EFFICACES (A HAUTE ENERGIE) PAR LES THEORIES A UN ELECTRON POUR LES MOLECULES A COUCHES COMPLETES (N::(2), CO), MAIS NON POUR O::(2) (POSITION EN ENERGIE, LARGEUR ET INTENSITE DE LA RESONANCE DE FORME POUR L'ETAT B**(4)SIGMA ::(G)**(-)). IMPORTANCE DE LA PREDISSOCIATION D'ETATS DE RYDBERG POUR LES MOLECULES TRIATOMIQUES (H::(2)O, CS::(2)) EN COMPETITION AVEC L'AUTOIONISATION. OBSERVATION DE LA VARIATION DE LA SECTION EFFICACE EN MARCHES D'ESCALIER, CORRESPONDANT A LA FORMATION DE DIFFERENTS ETATS VIBRATIONNELS AU SEUIL DE PHOTOIONISATION (AVEC VALIDITE DU PRINCIPE DE FRANCK-CONDON). MISE EN EVIDENCE D'UNE DECROISSANCE BRUTALE DES VOIES DEJA OUVERTES AU PASSAGE D'UN NOUVEAU SEUIL D'IONISATION, DUE A LA CONTINUITE DE LA FORCE D'OSCILLATEUR DU SPECTRE DISCRET AU CONTINUUM; MISE A PROFIT POUR DETECTER LE TAUX DE PREDISSOCIATION DES ETATS DE RYDBERG CONVERGEANT VERS DES ETATS EXCITES DE L'ION
Author: PASCAL.. LABLANQUIE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 221
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Book Description
PAR SPECTROMETRIE PHOTOELECTRONIQUE, ETUDE DE LA PHOTOIONISATION SIMPLE EN COUCHE DE VALENCE INTERNE ET EXTERNE DE N::(2). LIMITES D'UN MODELE A ELECTRONS INDEPENDANTS ET IMPORTANCE DES INTERACTIONS ELECTRONIQUES; ANALYSE DETAILLEE DES STRUCTURES APPARAISSANT POUR DES PHOTONS DE 23 EV, MONTRANT LES COMPORTEMENTS DE DEUX TYPES D'ETATS AUTOIONISANTS; COMPARAISON DES RESONANCES DE FORME DES ETATS DE SYMETRIE SIGMA G**(+). REALISATION D'UN DISPOSITIF EXPERIMENTAL POUR L'ETUDE DE PHOTOIONISATION DOUBLE ET ETUDE DE CS::(2) EN ASSOCIANT LA SPECTROMETRIE DE MASSE A UNE TECHNIQUE DE COINCIDENCE ION ION; OBSERVATION DE DEUX TYPES DE PHOTOIONISATION DOUBLE DISSOCIATIVE, DONT ON DISCUTE LES MECANISMES
Author: Jean-Paul Blaizot
Publisher: Mit Press
ISBN: 9780262022149
Category : Science
Languages : en
Pages : 657
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Book Description
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.
