Download or read book Double ionisation d atomes soumis des impulsions laser intenses written by François Mauger and published by . This book was released on 2012 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: When subjected to strong and short laser pulses, atoms may lose electrons. Several ionization channels are involved in such double ionization events, like nonsequential double ionization (NSDI) and its associated recollision scenario. Recollision is now seen as the “keystone of strong field physics”, for its insights into the organization of matter, and is one of the most dramatic manifestations of electron-electron correlation in nature. In this manuscript a theoretical analysis of the double ionization mechanisms is carried out using classical mechanics. This description complements quantum treatments by observing the dynamics from a different framework, with the light of nonlinear dynamics, as both frameworks exhibit the main ingredient, i.e., strong electron-electron correlation. The analysis, carried out in phase space (e.g., through reduced models) enables the identification of the organizing structures that regulate the ionization channels. For linearly polarized lasers, the recollision mechanism is completed by the picture of the “inner” electron. The inner electron gives access to a fine description of the recollision dynamics and explains the routes to double ionization. It also enables verifiable predictions such as the location of the characteristic knee shape in the double ionization yield versus laser intensity and fully explains delayed ionizations like RESI. For circular polarization, it is commonly believed that recollision is not possible, despite apparently contradictory experimental results. In fact, the phase space analysis shows that recollision is possible but not accessible to all atoms, thus reconciling the previous experimental results.
Download or read book Some Advancement in Ionization of Atoms and Molecules in Intermediate Intensity Regime Using Ultra fast Laser Pulses written by Seyed Mehdi Sharifi Kalahroudi and published by . This book was released on 2010 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans cette thèse, nous présentons une étude de l'ionisation multiphotonique ou tunnel de certains atomes et molécules dans un régime intermédiaire d'intensité (~1013-1014 W/cm2) en utilisant des impulsions provenant d'un laser ultra rapide Ti:saphir. En étudiant l'ionisation à deux couleurs de Ar et de Xe, nous présentons un modèle pour quantifier les contributions tunnel quasi-statique et multiphotonique. La dépendance du taux d'ionisation de Ar et de Xe sur l'angle entre les vecteurs de polarisation de deux impulsions ([omega] et 2 [omega] est mesurée. L'ionisation de cinq molécules organiques, C6H6, C5NH5, C3H6, C2H4, et C2H2, est étudiée. Deux phénomènes sont observés. La première observation montre que la probabilité d'ionisation jusqu'à un état uniquement chargé (+1) est supprimée en comparaison avec des atomes fictifs ayant le même potentiel d'ionisation. La seconde montre que l'ionisation double de ces molécules se produit principalement par un processus non séquentiel. Ces molécules présentent une probabilité relative énorme pour l'ionisation non séquentielle, qui est attribuée à la suppression de l'ionisation multiphotonique ou tunnel d'un ion de charge +1. Finalement, pour une application de spectroscopic laser, les spectres de masse de deux isomères de butène, 1-butène et cis-2-butène ionisés par des impulsions laser femtosecondes intenses sont comparés. On montre que la différence entre ces deux spectres est beaucoup plus prononcée que celle qu'on observe sur des spectres obtenus par collisions d'électrons de 100 eV. Notre observation suggère l'application possible de l'ionisation multiphotonique dissociative par des impulsions d'un laser ultrarapide pour la spectroscopic de masse de haute performance pour distinguer des molécules similaires.
Download or read book Etude de l ionisation d atomes par des impulsions laser intenses et ultra br ves written by Guillaume Duchateau and published by . This book was released on 2001 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ionisation d'atomes ayant un à deux électrons de valence par des impulsions laser intenses (10 puuissance 14 à 10 puissance 18 W/cm2) et ultrabrèves (quelques 10 puissance -17 à quelques 10 puissance -15 s) est abordée par une méthode originale qui s'appuie sur les états de Coulomb-Volkov. Ces derniers décrivent bien l'état d'un électron soumis aux champs d'un laser et d'un noyau. La nouvelle approche permet, dans des conditions bien identifiées, de prédire avec précision les caractéristiques des électrons éjectés. On identifie deux situations extrèmes relevant, l'une de l'approximation soudaine en champ peu oscillant, l'autre du domaine perturbatif avec des impulsions contenant suffisamment de cycles optiques. Le champ laser exhibe son caractère de champ classique dans le premier cas, celui d'un champ de photons dans le second cas. Le processus d'ionisation apparaît donc de façon très différente selon les situations.
Download or read book Double Ionization of Multi electron Atoms Exposed to Intense Femtosecond Laser Pulses written by Raphael Panfili and published by . This book was released on 2002 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ionisation of Atoms by Intense Laser Pulses written by Attila Tóth and published by . This book was released on 2013 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book IONISATION MULTIPHOTONIQUE D ATOMES AVEC DES IMPULSIONS LASER ULTRA COURTES written by L. A. Lompré and published by . This book was released on 1979 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA VARIATION DE LA PROBABILITE D'IONISATION RESONNANTE EN FONCTION DU TEMPS POUR L'ATOME DE CESIUM. ELLE PERMET DE DEFINIR 2 REGIMES DISTINCTS A PARTIR D'UN TEMPS CARACTERISTIQUE: POUR DES TEMPS PLUS COURTS LA PROBABILITE VARIE EN T**(3) EN FONCTION DU TEMPS, POUR DES TEMPS PLUS LONG, LA PROBABILITE EST LINEAIRE EN FONCTION DU TEMPS. ETUDE DES RESONANCES DANS LE CAS D'ECLAIREMENT INTENSE SUR DES ATOMES DE KRYPTON, DE NEON ET D'HELIUM. INTERPRETATION THEORIQUE PAR LA THEORIE DES PERTURBATIONS QUI RESTE VALABLE MEME A DES CHAMPS ELECTRIQUES INTENSES
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 Quantum Mechanics Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Pandex Current Index to Scientific and Technical Literature written by and published by . This book was released on 1970 with total page 1404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book COLOQ 6 written by Alain Aspect and published by . This book was released on 2000 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bearing Steel Technology written by John M. Beswick and published by ASTM International. This book was released on 2007 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Turbulence written by Genevieve Comte-Bellot and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1964 the main function of the European Mechanics Committee has been to arrange Euromech Colloquia. These are three- or four-day meetings for the discussion of current research on a specified and relatively narrow topic in mechanics, by about 50 specialists chosen for their active involvement in research in that topic. The organization of each Euromech Colloquium is entrusted by the Committee to one or two selected scientists of repute in the field, and these organizers are enjoined to achieve a friendly and informal forum for discussion, with a minimum of paper work and expenditure. Over 220 Euromech Colloquia have been held since 1964 (about 40 each in France, West Germany and Britain and the remainder in 18 countries in both western and eastern Europe) on a wide range of topics drawn from the mechanics of solid materials, hydrodynamics, gas dynamics and mechanical systems. The Committee believes that collectively, Euromech Colloquia have made a significant contribution to the exchange of ideas on topics in mechanics within Europe and have thereby helped to overcome the barriers to easy scientific communication in that sorely divided continent. A few years ago the European Mechanics Committee turned its atten tion to the possible need for European conferences on a larger scale than Euromech Colloquia.
Download or read book Composite Structures written by I.H. Marshall and published by Springer. This book was released on 1991-09-30 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers contained herein were presented at the Sixth International Conference on Composite Structures (ICCS/6) held at Paisley College, Scotland in September 1991. The Conference was organised and sponsored by Paisley College. It was co-sponsored by Scottish Enterprise, the National Engineering Laboratory, the US Army Research, Development and Standardisation Group-UK, Strathclyde Regional Council and Renfrew District Council. It forms a natural and ongoing progression from the highly successful ICCS/1/2/3/4 and 5 held at Paisley in 1981, 1983, 1985, 1987 and 1989 respectively. As we enter the final decade of this century many organisations throughout the world are adopting a prophetic role by attempting to forecast future scientific advances and their associated impact on mankind. Although some would argue that to do so is folly, without such futuristic visionaries the world would be that much poorer. IntelJigent speculation based on research trends and historical advances, rather than fanciful theories, breathes a healthy air of enthusiasm into the scientific community. Surely this is the very oxygen necessary to ignite the fir~s of innovation and invention amongst pioneers of research.
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 Light Filaments written by Jean-Claude Diels and published by IET. This book was released on 2022 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume starts with tutorials about the science of filamentation before presenting in-depth chapters on the latest research, technologies and applications. It cover wide aspects of light filaments considering various mediums of propagation, with structured or single filaments, and filaments of different colours, as well as combined filaments. It also includes a wide range of applications from strong field ionisation and molecular properties to laser development and beam shaping, THz, lasing in air and supercontinuum generation.
Download or read book Transport Packaging for Radioactive Materials written by and published by . This book was released on 1976 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Health Effects of Environmental Pollution written by and published by . This book was released on 1973 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
