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Book Description
DISCUSSION DES PROBLEMES D'INTERACTION CONTROLANT LA PROBABILITE DE TRANSITION ENTRE UN ETAT COVALENT ET UN ETAT IONIQUE, A L'AIDE DES CALCULS DE LANDAU-ZENER, DEMKOV ET NIKIZIN. LES DISSOCIATIONS LE LONG DE L'AXE INTERNUCLEAIRE ETANT RAPIDES PAR RAPPORT A LA PERIODE DE ROTATION DE LA MOLECULE, LA DISTRIBUTION ANGULAIRE DES FRAGMENTS REFLETE L'ORIENTATION DE LA MOLECULE CIBLE, FONCTION DE LA SYMETRIE DE L'ETAT EXCITE DISSOCIANT ET DE LA NATURE DE L'INTERACTION ENTRE ELECTRONS ET MOLECULES. DISCUSSION DES CORRECTIONS MULTIPOLAIRES DE VAN BRUNT. ANALYSE DES RESULTATS EXPERIMENTAUX POUR H::(2), O::(2) ET CO, OBTENUS AVEC DES ELECTRONS DE 0-100 EV
Book Description
DISCUSSION DES PROBLEMES D'INTERACTION CONTROLANT LA PROBABILITE DE TRANSITION ENTRE UN ETAT COVALENT ET UN ETAT IONIQUE, A L'AIDE DES CALCULS DE LANDAU-ZENER, DEMKOV ET NIKIZIN. LES DISSOCIATIONS LE LONG DE L'AXE INTERNUCLEAIRE ETANT RAPIDES PAR RAPPORT A LA PERIODE DE ROTATION DE LA MOLECULE, LA DISTRIBUTION ANGULAIRE DES FRAGMENTS REFLETE L'ORIENTATION DE LA MOLECULE CIBLE, FONCTION DE LA SYMETRIE DE L'ETAT EXCITE DISSOCIANT ET DE LA NATURE DE L'INTERACTION ENTRE ELECTRONS ET MOLECULES. DISCUSSION DES CORRECTIONS MULTIPOLAIRES DE VAN BRUNT. ANALYSE DES RESULTATS EXPERIMENTAUX POUR H::(2), O::(2) ET CO, OBTENUS AVEC DES ELECTRONS DE 0-100 EV
Author: Steven L. Guberman Publisher: Springer Science & Business Media ISBN: 1461500834 Category : Science Languages : en Pages : 467
Book Description
Dissociative Recombination of Molecular Ions with Electrons is a comprehensive collection of refereed papers describing the latest developments in dissociative recombination research. The papers are written by the leading researchers in the field. The topics covered include the use of microwave afterglows, merged beams and storage rings to measure rate coefficients and to identify the products and their yields. The molecules studied range in size from the smallest, H2+, to bovine insulin ions. The theoretical papers cover the important role of Rydberg states and the use of wave packets and quantum defect theory to deduce cross sections, rate constants and quantum yields. Several theoretical and experimental papers address the controversial topic of H3+ dissociative recombination and its importance in the interstellar medium. Dissociative recombination studies of other molecular ions in the interstellar medium and in cometary and planetary atmospheres are covered. Ionization is an important competitive process to dissociative recombination and its competition with predissociation and its role in the reverse process of the association of neutral species is presented. Dissociative attachment, in which an electron attaches to a neutral molecule, has many similarities to dissociative recombination. The topics covered include the accurate calculation of electron affinities, attachment to molecules, clusters, and to species absorbed on solid surfaces and electron scattering by a molecular anion.
Author: Valéry Nana Ngassam Publisher: ISBN: Category : Languages : en Pages : 162
Book Description
Dissociative recombination and related processes are specially effective in interstellar media where the very low density and temperature favour exothermic reactions. They also play an important role in various types of “cold” plasmas. This work reports the study of dissociative recombination of H2+, Ne2+ and HCNH+ molecular ions. The molecular states and their mutual interactions (for Ne2+ + e- and HCNH+ + e- systems) are calculated by ab initio methods: CI calculations for the bound part of the energy spectrum and electron-molecule scattering within the framework of the complex Kohn variational method for the continuous part. The low-energy dynamics (H2+ et Ne2+) is then treated by the multichannel quantum defect method. Several extensions of the formalism were developed in order to take account of the “off the energy shell” effects and to explicitly include the non-adiabatic couplings of the Rydberg states open to dissociation either between them or with the ion continuum.
Author: Jacques Lafontaine Publisher: Springer ISBN: 3319207350 Category : Mathematics Languages : en Pages : 408
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
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: Sue Blattes Publisher: L'Editeur : EDP Sciences ISBN: 9782868835888 Category : English language Languages : fr Pages : 264
Book Description
Cet ouvrage, devenu célèbre sous son sigle MCSE, a déjà été utilisé par plus de 50 000 étudiants, chercheurs, professionnels. L'objectif est de lire et écrire des textes en anglais scientifique avec facilité et pertinence. L'ouvrage est conçu pour que l'apprenant devienne un véritable utilisateur de l'anglais. La méthode originale repose sur l'analyse des fonctions et structures nécessaires : measurement, frequency, comparison, modification, link words, time, cause and consequence, hypothesis, modality, purpose and process, impersonal forms, compound nouns and adjectives. Dans chaque unit, des tests d'auto-évaluation permettent de se situer et de construire son parcours de formation, d'abord en définissant ses objectifs à l'aide des key points et du lexis, puis, de façon plus personnalisée, en puisant dans les examples in context, checkpoints (back to basics, word web), web search, FAQs... MCSE est l'outil de base d'une méthode qui comprend aussi d'autres outils dans la même collection (Listening Comprehension for Scientiflc English et Speaking Skills in Scientitic English). L'ouvrage est destiné à tout apprenant de niveau baccalauréat qui désire acquérir une réelle compétence dans l'écriture et la lecture de textes en anglais scientifique.
Author: J.A. McGeough Publisher: Springer Science & Business Media ISBN: 9780412319709 Category : Technology & Engineering Languages : en Pages : 278
Book Description
Provides production and mechanical engineers with the techniques of machining that have been developed to deal with new materials such as polymers, hard metals and ceramics, difficult to treat by conventional methods because of either hardness of components or the high accuracies of machining required. Annotation copyright Book News, Inc. Portland.
Author: PATRICE.. DELON
Author: PATRICE.. DELON
Author: Steven L. Guberman
Author: Valéry Nana Ngassam
Author: 
Author: Henry Eugène de Méric
Author: Jacques Lafontaine
Author: P. M. Banks
Author: Goddard Space Flight Center. Office of Public Affairs
Author: Sue Blattes
Author: J.A. McGeough