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Etude Des Proprietes Electroniques De Dimeres Dalcalins
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Book Synopsis Etude des propriétés électroniques de dimères d’alcalins by : Sihem Azizi
Download or read book Etude des propriétés électroniques de dimères d’alcalins written by Sihem Azizi and published by . This book was released on 2006 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: The alkaline dimers and their cations have been studied previously with classical spectroscopy techniques and photoassociation of cold atoms. One of the goals of this study was to obtain molecular data appropriate to the interpretation of collisionnal processes. We did a systematic study of molecular alkaline ions while assessing the precision of the results depending on the hypothesis which had been chosen. We compared our results obtained with a pseudopotential method with those obtained with a potential method for the heavy ions Rb2+, Cs2+ and RbCs+. The rates of photoassociation of mixed alkali dimers, as well as the rates of formation of cold molecules in the ground stats, were calculated using a perturbative approach for which the wavefunctions are exactly determined. These rates have the same magnitude for all the heteronuclear dimers contained Rb and Cs atoms. The rates of cold molecules formation are similar to those mesured and computed for Cs2 molecules. We studied the specific case of photoassociation in two states coupled by a spin-orbit interaction who emphasizes the role of the resonant coupling in the formation of stable cold molecules in levels weakly excited.
Book Synopsis ETUDE DES PROPRIETES ELECTRONIQUES DES PETITS AGREGATS ALCALINS by : BRIGITTE.. VEZIN-PINTAR
Download or read book ETUDE DES PROPRIETES ELECTRONIQUES DES PETITS AGREGATS ALCALINS written by BRIGITTE.. VEZIN-PINTAR and published by . This book was released on 1994 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL PRESENTE L'ETUDE DES PROPRIETES ELECTRONIQUES DES PETITS AGREGATS DE LITHIUM PURS, LI#N, ET DE LITHIUM HYDROGENES, LI#NH#M. CES AGREGATS SONT PRODUITS PAR DETENTE D'UNE VAPEUR DE LITHIUM DANS UN JET SUPERSONIQUE AVEC GAZ PORTEUR ARGON/HYDROGENE. DEUX TECHNIQUES D'ANALYSE EXPERIMENTALES SONT UTILISEES. LA MESURE DES POTENTIELS D'IONISATION, PAR PHOTOIONISATION, MET EN EVIDENCE DES EFFETS DE COUCHE, QUI SONT INTERPRETES DANS LE CADRE DU MODELE DU JELLIUM, ET DES EFFETS MOLECULAIRES. LE CARACTERE METALLIQUE, SE TRADUISANT PAR LA DELOCALISATION DES N ELECTRONS DE VALENCE D'UN AGREGAT LI#N, EST PRESENT DES LES PETITES TAILLES. L'ETUDE DES POTENTIELS D'IONISATION DES LI#NH#M PERMET DE CARACTERISER L'INFLUENCE D'UN OU PLUSIEURS ATOMES D'HYDROGENE SUR UN AGREGAT DE LITHIUM. IL EST MONTRE QU'UN ATOME D'HYDROGENE LOCALISE UN DES ELECTRONS DE VALENCE DES ATOMES DE LITHIUM, AFIN D'ASSURER SA LIAISON. LA COMPARAISON AVEC DES CALCULS AB INITIO PERMET EGALEMENT DE FAIRE UNE PREMIERE ATTRIBUTION DE STRUCTURES GEOMETRIQUES. L'ABSORPTION OPTIQUE DES AGREGATS LI#N ET LI#NH A ETE REALISEE PAR SPECTROSCOPIE A DEUX PHOTONS, ET PAR DEPOPULATION POUR LES AGREGATS DE TAILLE SUPERIEURE A TROIS (ETATS EXCITES DISSOCIATIFS). LES SPECTRES VIBRATIONNELS ET ROTATIONNELS DE L'ETAT B DE LI#2H, POUR LA PREMIERE FOIS ENREGISTRES, SONT ETUDIES. LES GEOMETRIES DES ETATS X ET B SONT DETERMINEES AVEC GRANDE PRECISION, GRACE A LA SIMULATION DES STRUCTURES ROTATIONNELLES. LE CARACTERE DES LIAISONS LI-H EST ANALYSE. L'ABSORPTION DES LI#NH MET EN EVIDENCE UN ABAISSEMENT DE SYMETRIE DES GEOMETRIES PAR RAPPORT A CELLES DES LI#N. LA PRESENCE DE L'ATOME D'HYDROGENE DEFORME LES STRUCTURES. PAR COMPARAISONS EXPERIENCES/THEORIE, LES GEOMETRIES DES LI4H ET LI9H SONT DETERMINEES
Book Synopsis Etude théorique de la structure et des propriétés électronique de différents composés d'alcalins by : Alya Jraij
Download or read book Etude théorique de la structure et des propriétés électronique de différents composés d'alcalins written by Alya Jraij and published by . This book was released on 2003 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les atomes d'alcalins ont toujours été l'objet d'un grand intérêt tant expérimental que théorique. Sur le plan théorique, les alcalins constituent des systèmes modèles, leur structure électronique présentant un seul électron de valence. De ce fait, il est possible de prédire avec une grande précision et de reproduire au mieux les résultats expérimentaux. C'est ainsi que des études théoriques accompagnent ou précèdent souvent les études expérimentales concernant des composés d'alcalins. Notre travail se situe dans le cadre d'une approche théorique de la structure électronique de différents systèmes d'alcalins : les cations diatomiques homonucléaires Rb2+ et Cs2+ et les agrégats de chlorure de césium CsnCln-1 (2=n=18). Pour ce faire, nous avons réalisé des calculs Hartree-Fock avec pseudopotentiel (et potentiel de polarisation). La méthode consiste à représenter les atomes intervenant dans ces systèmes par des pseudopotentiels non empiriques, des bases Gaussiennes relativement grandes et pour les ions diatomiques des potentiels de polarisation qui tiennent compte des effets de polarisation du cœur. Pour les deux ions Rb2+ et Cs2+, nous avons effectué le calcul pour 26 états 2 (+) (sans spin-orbite) et 38 états (avec spin-orbite), pour des distances internucléaires allant de 4 jusqu'à 130u.a. Nous avons calculé pour chaque ion les constantes spectroscopiques des différents états liés. Les résultats obtenus montrent un bon accord avec les rares observations expérimentales disponibles pour l'état fondamental de chaque ion. Pour les agrégats CsnCln-1, nous avons calculé les énergies totales et déterminé les structures des isomères stables. Pour chaque agrégat de taille n la plus stable et pour sa configuration, nous avons calculé le potentiel d'ionisation vertical, le moment dipolaire et les composantes de la polarisabilité dipolaire pour en déduire la susceptibilité électrique comparable aux mesures expérimentales. Plusieurs améliorations ont été introduites pour augmenter la précision du calcul. Nous pouvons dire que le modèle utilisé a réussi à reproduire des structures types d'halogénures d'alcalins et à donner des valeurs de la susceptibilité compatibles avec les données expérimentales disponibles, ceci pour la quasi totalité des tailles étudiées.
Book Synopsis CONTRIBUTION A L'ETUDE DES PROPRIETES ELECTRONIQUES DES SYSTEMES ALCALINS-METAUX DE TRANSITION by : Patrick Soukiassian
Download or read book CONTRIBUTION A L'ETUDE DES PROPRIETES ELECTRONIQUES DES SYSTEMES ALCALINS-METAUX DE TRANSITION written by Patrick Soukiassian and published by . This book was released on 1985 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDES DE L'ADSORTION DE CESIUM SUR LES FACES (100) DU TUNGSTENE, DU MOLYBDENE ET DU TANTALE POUR DES COUVERTURES COMPRISES ENTRE O ET UNE MONOCOUCHE, A L'AIDE DE MESURES DE PHOTOEMISSION ANGULAIRE UTILISANT LE RAYONNEMENT SYNCHROTRON OU DES MESURES DE PERTE D'ENERGIE D'ELECTRONS LENTS. LA CHIMISORPTION DU CS, ETUDIEE EN PHOTOEMISSION ANGULAIRE, PERMET DE REVELER, PRES DU NIVEAU DE FERMI, L'EXISTENCE D'UN ETAT DE SURFACE INSENSIBLE A L'ADSORPTION D'OXYGENE OU D'OXYDE DE CARBONE
Download or read book Canadian Journal of Physics written by and published by . This book was released on 2015 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Étude des actes primaires d'apparition et d'évolution des ions enphase gazeuse raréfiée by :
Download or read book Étude des actes primaires d'apparition et d'évolution des ions enphase gazeuse raréfiée written by and published by . This book was released on 1964 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermodynamics of Minerals and Melts by : R.C. Newton
Download or read book Thermodynamics of Minerals and Melts written by R.C. Newton and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today large numbers of geoscientists apply thermodynamic theory to solu tions of a variety of problems in earth and planetary sciences. For most problems in chemistry, the application of thermodynamics is direct and rewarding. Geoscientists, however, deal with complex inorganic and organic substances. The complexities in the nature of mineralogical substances arise due to their involved crystal structure and multicomponental character. As a result, thermochemical solutions of many geological-planetological problems should be attempted only with a clear understanding of the crystal-chemical and thermochemical character of each mineral. The subject of physical geochemistry deals with the elucidation and application of physico-chemical principles to geosciences. Thermodynamics of mineral phases and crystalline solutions form an integral part of it. Developments in mineralogic thermody namics in recent years have been very encouraging, but do not easily reach many geoscientists interested mainly in applications. This series is to provide geoscientists and planetary scientists with current information on the develop ments in thermodynamics of mineral systems, and also provide the active researcher in this rapidly developing field with a forum through which he can popularize the important conclusions of his work. In the first several volumes, we plan to publish original contributions (with an abundant supply of back ground material for the uninitiated reader) and thoughtful reviews from a number of researchers on mineralogic thermodynamics, on the application of thermochemistry to planetary phase equilibria (including meteorites), and on kinetics of geochemical reactions.
Book Synopsis Density Waves In Solids by : George Gruner
Download or read book Density Waves In Solids written by George Gruner and published by CRC Press. This book was released on 2018-03-08 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: ?Density Waves in Solids is written for graduate students and scientists interested in solid-state sciences. It discusses the theoretical and experimental state of affairs of two novel types of broken symmetry ground states of metals, charge, and spin density waves. These states arise as the consequence of electron-phonon and electron-electron interactions in low-dimensional metals.Some fundamental aspects of the one-dimensional electron gas, and of the materials with anisotropic properties, are discussed first. This is followed by the mean field theory of the phases transitions?discussed using second quantized formalism?together with the various experimental observations on the transition and on the ground states. Fluctuation effects and the collective excitations are reviewed next, using the Ginzburg-Landau formalism, followed by the review of the interaction of these states with the underlying lattice and with impurities. The final chapters are devoted to the response of the ground states to external perturbations.
Book Synopsis Chemistry and Significance of Condensed Tannins by : Richard W. Hemingway
Download or read book Chemistry and Significance of Condensed Tannins written by Richard W. Hemingway and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was developed from the proceedings of the first North American Tannin Conference held in Port. Angeles, Washington, August 1988. The objective of the conference was to bring together people with a common interest in condensed tannins and to promote interdisciplinary interactions that will lead to a better understanding of these important substances. Anot. her objective was the publicat. ion of this book because there has not been a monograph devoted to the chemistry and significance of tannins for several decades. The book is organized into sections dealing with the biosynthesis, structure, re actions, complexation with other biopolymers, biological significance, and use of tannins as specialty chemicals. The authors made a special attempt to focus on what we don't know as well as to provide a summary of what we do know in an effort to assist in planning future research. Our thanks go to the authors who so kindly contributed chapters and so pa tiently responded to our requests. We also thank Rylee Geboski and the Conference Assist. ance Staff, College of Forestry, Oregon State University, for their assistance in planning and conducting t. he conference, and Julia Wilson, Debbie Wolfe, Helen Coletka, and Nancy Greene of the Southern Forest Experiment Station, Pineville, Louisiana, who typed the chapt. ers. Linda Chalker-Scott was especially helpful in assisting us wit. h editing. Dick Hemingway is indebted t. o the staff of the Alexandria Forest.
Book Synopsis Electronic Structure and Chemical Bonding by : J. R. Lalanne
Download or read book Electronic Structure and Chemical Bonding written by J. R. Lalanne and published by World Scientific. This book was released on 1996 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the problem of teaching the Electronic Structure and Chemical Bonding of atoms and molecules to high school and university students. It presents the outcomes of thorough investigations of some teaching methods as well as an unconventional didactical approach which were developed during a seminar for further training organized by the University of Bordeaux I for teachers of the physical sciences.The text is the result of a collective effort by eleven scientists and teachers: physicists and chemists doing research at the university or at the CRNS, university professors, and science teachers at high-school or university level.While remaining wide open to the latest discoveries of science, the text also offers a large number of problems along with their solutions and is illustrated by several pedagogic suggestions. It is intended for the use of teachers and students of physics, chemistry, and of the physical sciences in general.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Semiconductor Gas Sensors by : Raivo Jaaniso
Download or read book Semiconductor Gas Sensors written by Raivo Jaaniso and published by Woodhead Publishing. This book was released on 2019-09-24 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor Gas Sensors, Second Edition, summarizes recent research on basic principles, new materials and emerging technologies in this essential field. Chapters cover the foundation of the underlying principles and sensing mechanisms of gas sensors, include expanded content on gas sensing characteristics, such as response, sensitivity and cross-sensitivity, present an overview of the nanomaterials utilized for gas sensing, and review the latest applications for semiconductor gas sensors, including environmental monitoring, indoor monitoring, medical applications, CMOS integration and chemical warfare agents. This second edition has been completely updated, thus ensuring it reflects current literature and the latest materials systems and applications. - Includes an overview of key applications, with new chapters on indoor monitoring and medical applications - Reviews developments in gas sensors and sensing methods, including an expanded section on gas sensor theory - Discusses the use of nanomaterials in gas sensing, with new chapters on single-layer graphene sensors, graphene oxide sensors, printed sensors, and much more
Download or read book Citric Acid written by Alexander Apelblat and published by Springer. This book was released on 2014-12-04 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is devoted to different aspects associated with citric acid, inorganic citrates and their aqueous and organic solutions. It includes information about properties, occurrence and technological applications of citric acid and inorganic citrates. Phase equilibria - melting, freezing, boiling, vapour pressures, solubilities of citric acid in water, organic solvents and ternary systems are presented, correlated, and analyzed. Dynamic properties - viscosities, diffusion coefficients, electrical conductivities and surface tensions are examined. Mathematical representations of citric acid dissociation, in electrolyte solutions and in buffers are discussed. Citric acid chemistry - syntheses of citric acid, neutralization, degradation, oxidation, esterification, formation of anhydrides, amides and citrate-based siderophores is reviewed.
Book Synopsis Les Congrés et colloques de l'Université de Liège by : Université de Liège
Download or read book Les Congrés et colloques de l'Université de Liège written by Université de Liège and published by . This book was released on 1964 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography written by Pierre Villars and published by Walter de Gruyter. This book was released on 2012-12-21 with total page 1827 pages. Available in PDF, EPUB and Kindle. Book excerpt: By browsing about 10 000 000 scientific articles of over 200 major journals mainly in a 'cover to cover approach' some 200 000 publications were selected. The extracted data is part of the following fundamental material research fields: crystal structures (S), phase diagrams (also called constitution) (C) and the comprehensive field of intrinsic physical properties (P). This work has been done systematically starting with the literature going back to 1900. The above mentioned research field codes (S, C, P) as well as the chemical systems investigated in each publication were included in the present work. The aim of the Inorganic Substances Bibliography is to provide researchers with a comprehensive compilation of all up to now published scientific publications on inorganic systems in only three handy volumes.
Download or read book Exchange Reactions written by and published by . This book was released on 1965 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Primary Explosives by : Robert Matyáš
Download or read book Primary Explosives written by Robert Matyáš and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first comprehensive overview of this topic. It serves as a single source for information about the properties, preparation, and uses of all relevant primary explosives. The first chapter provides background such as the basics of initiation and differences between requirements on primary explosives used in detonators and igniters. The authors then clarify the influence of physical characteristics on explosive properties, focusing on those properties required for primary explosives. Furthermore, the issue of sensitivity is discussed. All the chapters on particular groups of primary explosives are structured in the same way, including introduction, physical and chemical properties, explosive properties, preparation and documented use. The authors thoroughly verified all data and information. A unique feature of this book are original microscopic images of some explosives.
