Download or read book tude th orique du contr le de la dissociation mol culaire par impulsion laser et spectroscopie de photo lectrons written by Selma Engin and published by . This book was released on 2013 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse propose un nouveau type de dispositif pompe-sonde permettant de suivre par spectroscopie de photoélectrons (sonde) la dynamique d’élongation de la liaison de la molécule de chlorure d’hydrogène soumise à une impulsion laser infrarouge (pompe IR). L'originalité de ce dispositif réside dans l'utilisation de la technique Raman Chirped Adiabatic Passage (RCAP) pour la pompe IR et la spectroscopie de niveaux de cœur (XPS ou ESCA) pour la sonde X. Le procédé RCAP permet de monter l'échelle des niveaux vibrationnels sélectivement et séquentiellement et la sonde X permet de suivre cette évolution grâce à sa grande sensibilité à l’environnement chimique. Dans ce manuscrit sont décrits les développements théoriques et les outils numériques indispensables pour simuler le dispositif pompe-sonde RCAP-X et la structure électronique de la molécule HCl. L’interaction entre la molécule et le rayonnement est modélisée dans des conditions réalistes, prenant en compte les effets d’orientation de la molécule et la dynamique rotationnelle (température). Les conditions optimales de transfert de population sont déterminées par la recherche systématique des meilleurs jeux de paramètres laser (intensité, chirp). Les spectres de photoélectrons calculés montrent un déplacement en fonction du temps des pics satellites attribués à des processus shake-up. Cette évolution est la signature d’une dynamique vibrationnelle. L’étude théorique développée dans ce manuscrit montre que ce dispositif pompe-sonde pourrait être opérationnel en utilisant des lasers Titane-Saphir dans une gamme d’intensités voisines de 5x1012 W/cm2 et un chirp de l’ordre de10-5-10-6 eV/fs, dans des conditions de basses températures (
Download or read book Strat gies de contr le laser de la dynamique mol culaire written by Catherine Lefebvre and published by . This book was released on 2008 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies the phenomenology of the molecular dynamics in intense laser field and, more precisely the basic mechanisms in the stabilization of a molecule with respect to the dissociation. The main line in these works concerns the dynamics of the Floquet resonances in intense laser field. Simple and generic strategies are proposed and applied to the one-dimension model of H2+ molecular ion for which time-dependent wavepacket calculations have been performed. Starting from the synchronization mechanism between the wavepacket movements and those of the potential energy curves, originally established in the infrared spectral domain where the quasi-static picture is used, we propose a scenario to extend its application to the ultraviolet-visible spectral domain where the multiphotonic picture is valid. In the Floquet representation, we observe a breathing of the dressed potential energy curves at the one-photon crossing following, not the carrier-wave oscillations, but those of the envelope of frequency lying in the infrared. We are particularly interested in the dependance of the molecular dynamics on the phase of the envelope and we use a recent reformulation of the Floquet theory to establish the origin of the dynamical role of the absolute phase. By a simple optimization of the optical parameters, we take advantage of the different basic mechanisms in the multiphotonic and quasi-static pictures in order to stabilize the molecule with respect to the dissociation via an adiabatic transfer of an initial vibrational state onto a resonance. Even more efficiently, this transfer is done onto a zero-width resonance. All these multiphotonic processes are then applied to the problem of the dissociative ionization of H2 for which we study the dynamics of H2+ molecular ion under a femtosecond near-infrared laser pulse, previously prepared from the neutral molecule by an extreme ultraviolet attosecond pulse. The study of the adiabatic or non-adiabatic character of the preparation of the ion and its subsequent evolution under the infrared pulse allows one to retrieve a signature of the dynamics of the Floquet resonances and an indirect image of the initial vibrational wavepacket. This type of molecular dynamics imaging brings a theoretical support for interpretation of experimental results concerning the photofragment kinetic energy spectra. Finally, using the same reformulation of the Floquet theory, we demonstrate the existence of a wavepackets interferometry, the wavepackets being individually prepared successively by each attosecond pulse in a train. This new scheme of an extreme ultraviolet attosecond pump pulse combined with an infrared femtosecond probe pulse gives in principle a strategy to characterize attosecond pulse trains.
Download or read book Contr le de processus mol culaires par impulsions laser intenses written by Stéphane Guérin and published by . This book was released on 1996 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS AVONS ELABORE DES OUTILS THEORIQUES POUR INTERPRETER ET PREDIRE LE CONTROLE DE TRANSFERT DE POPULATION DANS UN SYSTEME QUANTIQUE INTERAGISSANT AVEC UNE RADIATION MULTIMODE INTENSE POUVANT CONTENIR DES MODULATIONS D'AMPLITUDE (MODELISATION D'IMPULSIONS) ET DE FREQUENCE (MODELISATION DU CHIRPING). NOUS AVONS MIS EN EVIDENCE LA PRESENCE THEORIQUE D'UNE FREQUENCE EFFECTIVE GOUVERNANT LA PHYSIQUE DU SYSTEME. LA THEORIE DE FLOQUET, COMBINEE AVEC DES PRINCIPES ADIABATIQUES, EST PRESENTEE AVEC UNE FORMULATION DECOULANT DE LA THEORIE DES ETATS HABILLES DANS UNE CAVITE ET PERMETTANT L'INTERPRETATION DES ECHANGES DE PHOTONS ENTRE LA MATIERE ET UN RAYONNEMENT INTENSE. NOUS AVONS DEVELOPPE DES OUTILS DE SIMULATION NUMERIQUE ADAPTES A L'ETUDE GENERALE DE PROCESSUS D'INTERACTION LASER-MOLECULES. CETTE THEORIE A ETE APPLIQUEE AU CONTROLE DE PROCESSUS MOLECULAIRES. NOUS AVONS TRAITE EN PARTICULIER LE CONTROLE PAR IMPULSION LASER DU TEMPS DE PASSAGE PAR EFFET TUNNEL ET LA DISSOCIATION COMPLETE PAR UNE IMPULSION LASER INFRA-ROUGE, CONTENANT UN BALAYAGE EN FREQUENCE, D'UNE MOLECULE DIATOMIQUE DANS SON ETAT ELECTRONIQUE FONDAMENTAL
Download or read book Neutral dissociation of superexcited molecules in a strong laser field written by Ali Azarm and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Molecular Hydrodynamics written by Jean Pierre Boon and published by Courier Corporation. This book was released on 1991-01-01 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: A graduate level introduction to the theory and applications of time correlation functions and the molecular theory of fluid dynamics. "Quite well organized . . . the literature coverage is impressive." — Physics Today. 110 illustrations.
Download or read book Organic Solid State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
Download or read book Coherent Vibrational Dynamics written by Guglielmo Lanzani and published by CRC Press. This book was released on 2007-11-29 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Remarkable developments in the spectroscopy field regarding ultrashort pulse generation have led to the possibility of producing light pulses ranging from 50 to5 fs and frequency tunable from the near infrared to the ultraviolet range. Such pulses enable us to follow the coupling of vibrational motion to the electronic transitions in molecules and
Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.
Download or read book Diffusion in Materials DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.
Download or read book Laser 50 Years Of Discoveries written by Fabien Bretenaker and published by World Scientific. This book was released on 2014-10-27 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.
Download or read book X Ray and Neutron Reflectivity Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Download or read book Forest Fire Research written by Universidade de Coimbra and published by . This book was released on 2010 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt:
