Download or read book Th orie de l ionisation des atomes en champ laser intense written by Joseph Wassaf and published by . This book was released on 2002 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Super Intense Laser Atom Physics written by A. L'Huillier and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid development of powerful pulsed lasers is at the origin of a conside rable interest in studying the response of an atom, a molecule (or a solid) to a strong electromagnetic field. It is now possible to produce at the laboratory scale, ultra-short 13 pulses with a duration of 100 femtoseconds (10- second) and a power of the order 12 of 1 terawatt (10 Watt). Under these conditions, very high peak intensities may be obtained and electric fields exceeding typical electron binding fields in atoms are generated. The interaction of an atom or a molecule with such electromagnetic fields has a highly non-linear character which leads to unexpected phenomena. Amongst them, - above-threshold ionization (ATI) i.e. the absorption of additional photons in excess of the minimal number necessary to overcome the ionization potential and its molecular counterpart, above-threshold dissociation (ATD); - generation of very high harmonics of the driving field; - stabilization of one-electron systems in strong fields. These processes were the main topics of two international meetings which were held in 1989 and 1991 in the United States under the common name SILAP (Super-Intense Laser-Atom Physics).

Download or read book Canadian Journal of Chemistry written by and published by . This book was released on 2010-07 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Classical Trajectory Perspective of Atomic Ionization in Strong Laser Fields written by Jie Liu and published by Springer Science & Business Media. This book was released on 2013-09-30 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ionization of atoms and molecules in strong laser fields is an active field in modern physics and has versatile applications in such as attosecond physics, X-ray generation, inertial confined fusion (ICF), medical science and so on. Classical Trajectory Perspective of Atomic Ionization in Strong Laser Fields covers the basic concepts in this field and discusses many interesting topics using the semiclassical model of classical trajectory ensemble simulation, which is one of the most successful ionization models and has the advantages of a clear picture, feasible computing and accounting for many exquisite experiments quantitatively. The book also presents many applications of the model in such topics as the single ionization, double ionization, neutral atom acceleration and other timely issues in strong field physics, and delivers useful messages to readers with presenting the classical trajectory perspective on the strong field atomic ionization. The book is intended for graduate students and researchers in the field of laser physics, atom molecule physics and theoretical physics. Dr. Jie Liu is a professor of Institute of Applied Physics and Computational Mathematics, China and Peking University.

Download or read book Atoms in Intense Laser Fields written by C. J. Joachain and published by Cambridge University Press. This book was released on 2012 with total page 581 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unified account of the rapidly developing field of high-intensity laser-atom interactions, suitable for both graduate students and researchers.

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 Atoms in Intense Laser Fields written by C. J. Joachain and published by Cambridge University Press. This book was released on 2011-12-15 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of lasers capable of producing high-intensity pulses has opened a new area in the study of light-matter interactions. The corresponding laser fields are strong enough to compete with the Coulomb forces in controlling the dynamics of atomic systems and give rise to multiphoton processes. This book presents a unified account of this rapidly developing field of physics. The first part describes the fundamental phenomena occurring in intense laser-atom interactions and gives the basic theoretical framework to analyze them. The second part contains a detailed discussion of Floquet theory, the numerical integration of the wave equations and approximation methods for the low- and high-frequency regimes. In the third part, the main multiphoton processes are discussed: multiphoton ionization, high harmonic and attosecond pulse generation, and laser-assisted electron-atom collisions. Aimed at graduate students in atomic, molecular and optical physics, the book will also interest researchers working on laser interactions with matter.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1992 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Super Intense Laser Atom Physics written by Bernard Piraux and published by Springer. This book was released on 2001-03-31 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of atomic systems exposed to super-intense laser fields de fines an important area in atomic, molecular and optical physics. Although the concept of super-intense field has no absolute meaning, it is now usual to call an electromagnetic field super-intense when it exceeds the atomic binding field. In the case of the simplest atomic system, hydrogen in its 16 2 ground state, this occurs above an intensity of 3. 5 x 10 Wattfcm which is the atomic unit of intensity. Presently at the laboratory scale and in ex tremely short and tightly focussed laser pulses, the electric field strength 16 18 2 reaches peak values which are of the order of 10 - 10 Wattfcm in the infrared frequency regime, the prospect being that such peak intensities may be reached within a few years in a regime of much higher frequencies (XUV or even X). The interaction of such electromagnetic fields with an atomic system has a highly non-linear character which has led to the observation of to tally unexpected phenomena. There are three fundamental processes which have marked the beginning of an intensive research in the field of super intense laser-atom physics (SILAP). These processes which only involve one atomic electron are (i) the so-called above-threshold ionisation i. e.

Download or read book Super Intense Laser Atom Physics IV written by H.G. Muller and published by Springer. This book was released on 2011-11-25 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atoms in strong radiation fields are interesting objects for study, and the research field that concerns itself with this study is a comparatively young one. For a long period after the ~scovery of the photoelectric effect. it was not possible to generate electro magnetic fields that did more than perturb the atom only slightly, and (first-or~er) perturbation theory could perfectly explain what was going on at those low intensities. The development of the pulsed laser bas changed this state of affairs in a rather dramatic way, and fields can be applied that really have a large, or even dominant influence on atomic structure. In the latter case, w~ speak of super-intense fields. Since the interaction between atoms and electromagnetic waves is characterized by many parameters other than the light intensity, such as frequency, iQnization potential, orbit time, etc., it is actually quite difficult to define what is exactly meant by the term 'super-intense'. Obviously the term does not have an absolute meaning, and intensity should always be viewed in relation to other properties of the system. An atom in a radiation field can thus best be described in terms of various ratios of the quantities involved. The nature of the system sometimes drastically changes if the value of one of these parameters exceeds a certain critical value, and the new regime could be called super-intense with respect to that parameter.

Download or read book Etude th orique de l interaction entre un syst me 1 ou 2 lectrons actifs et un champ laser intense written by Éric Cormier and published by . This book was released on 1994 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS PRESENTONS UNE ETUDE DE L'INTERACTION ENTRE UN ATOME ET UN CHAMP LASER INTENSE ET PLUS PARTICULIEREMENT SA MANIFESTATION SOUS FORME DE PROCESSUS MULTIPHOTONIQUES. NOUS DECRIVONS DANS UN PREMIER TEMPS UNE METHODE DE CALCUL DE LA STRUCTURE ATOMIQUE BASEE SUR L'UTILISATION DE FONCTIONS B-SPLINES. NOUS EXPOSONS ENSUITE LES DIFFERENTES THEORIES ADAPTEES A L'ETUDE DE L'IONISATION MULTIPHOTONIQUE A TRAVERS DEUX APPROCHES: UN TRAITEMENT EN THEORIE DES PERTURBATIONS ET UN TRAITEMENT NON PERTURBATIF DEPENDANT DU TEMPS. CHACUNE DE CES THEORIES EST ILLUSTREE DANS L'APPLICATION A UN CAS CONCRET

Download or read book Etude des atomes d h lium et de b ryllium en champ laser intense et bref written by Stéphane Laulan and published by . This book was released on 2004 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous présentons une étude théorique de l'interaction entre un atome à deux électrons actifs et un champ laser de fort éclairement (10exposant14 à 10exposant15 W/cm2) et de durée d'impulsion ultra-brève (quelques 10exposant-15 à quelques 10exposant-18 s). Nous décrivons dans une premier temps les techniques expérimentales actuelles capables de produire un rayonnement cohérent de haute puissance dans le domaine spectral UV-XUV, et de durée d'impulsion de l'ordre de la femtoseconde ou subfemtoseconde. Un modèle semi-classique d'une impulsion laser avec de telles caractéristiques est alors défini. Puis, nous développons une méthode numérique basée sur l'utilisation des fonctions B-splines pour décrire la structure électronique d'un atome à deux électrons actifs. Un traitement non perturbatif de type spectral est alors proposé pour représenter la propagation dans le temps de la fonction d'onde du système irradié, où le point important est de définir le plus précisément possible la région du double continuum atomique. Nous exposons finalement des résultats sur la double ionisation des atomes d'hélium et de béryllium en présence d'un champ laser intense et bref, issus de notre approche numérique. Ils concernent en particuler des calculs de sections efficaces totales d'ionisation, et de distributions énergétiques entre les électrons éjectés dans le double continuum après absorption d'un photon et de deux photons.

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 IONISATION MULTIPLE DES MOLECULES DIATOMIQUES EN CHAMP LASER INTENSE written by JOSE.. LAVANCIER and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE EST CONSACREE A L'ETUDE EXPERIMENTALE DES INTERACTIONS ENTRE LES MOLECULES DIATOMIQUES ET LE RAYONNEMENT LASER INTENSE. L'ACCENT EST MIS SUR L'INFLUENCE DES PARAMETRES QUI CARACTERISENT LES IMPULSIONS LASER. POUR CELA, LES EXPERIENCES SONT EFFECTUEES DANS UNE LARGE GAMME D'ECLAIREMENT ET POUR DIFFERENTES LONGUEURS D'ONDE ET DUREES D'IMPULSIONS. L'INTERACTION PRODUIT UNE GRANDE VARIETE D'IONS ATOMIQUES ET MOLECULAIRES DONT L'ORIGINE EST DETERMINEE PAR L'ANALYSE DETAILLEE DES SPECTRES DE MASSE. A FORT ECLAIREMENT, ON OBSERVE DEUX MECANISMES D'EXCITATION QUI DEPENDENT DE LA MOLECULE ET DE LA LONGUEUR D'ONDE: 1) SOIT L'INTERACTION NE PEUPLE QUE DES ETATS EXCITES DE L'ION DOUBLEMENT CHARGE, CE PROCESSUS S'EFFECTUANT SANS MODIFICATION DE LA DISTANCE INTERNUCLEAIRE; 2) SOIT LA MOLECULE PERD CINQ ELECTRONS ET PEUT SE DISSOCIER SELON DIVERS CANAUX. ON CONSTATE ALORS QUE LA STRUCTURE MOLECULAIRE GOUVERNE LES DEUX PREMIERES ETAPES D'IONISATION MAIS SEMBLE PEU INFLUENTE LORS DES DERNIERES ETAPES. NOS RESULTATS S'INTERPRETENT A PARTIR DE L'HYPOTHESE D'UNE SEQUENCE D'IONISATION MULTIPLE A DES DISTANCES INTERNUCLEAIRES CROISSANTES. CE SONT ALORS LES ETATS DOUBLEMENT CHARGES QUI INITIALISENT LA REACTION EN SE DISSOCIANT PENDANT L'APPLICATION DE L'IMPULSION LASER. LA THEORIE DE L'IONISATION PAR CHAMP DONNE UNE ESTIMATION DES DISTANCES INTERNUCLEAIRES D'IONISATION ET DES ECLAIREMENTS D'APPARITION DES VOIES DISSOCIATIVES OBSERVEES

Download or read book Index bibliographique du vide written by and published by . This book was released on 1969 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book INIS Atomindex written by and published by . This book was released on 1986 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt: