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Author: K. C. Kulander Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
A method which involves the direct solution of the time dependent Schrodinger equations has been used in studies of the dynamics of excitation of and emission from atoms in intense, pulsed laser fields. A surprising array of effects have been observed during high-intensity, short-pulse laser excitation of atoms and molecules. To model the results of these measurements, we have developed methods to solve the time-dependent Schrodinger equation for an atom in a time varying, classical electromagnetic field. Studies on may atomic and molecular systems have been performed over a range of intensities from the regime within which perturbative techniques are valid up to field strengths well above an atomic unit (I> (3.51 x 10 to the 16th W)/sq. cm.). These calculations have provided predictions for ionization rates, 1 photoelectron energy and angular distributions and photoemission rates. The effects of ac Stark shifted and intensity broadened intermediate states on the emission processes have been investigated.
Author: K. C. Kulander Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
A method which involves the direct solution of the time dependent Schrodinger equations has been used in studies of the dynamics of excitation of and emission from atoms in intense, pulsed laser fields. A surprising array of effects have been observed during high-intensity, short-pulse laser excitation of atoms and molecules. To model the results of these measurements, we have developed methods to solve the time-dependent Schrodinger equation for an atom in a time varying, classical electromagnetic field. Studies on may atomic and molecular systems have been performed over a range of intensities from the regime within which perturbative techniques are valid up to field strengths well above an atomic unit (I> (3.51 x 10 to the 16th W)/sq. cm.). These calculations have provided predictions for ionization rates, 1 photoelectron energy and angular distributions and photoemission rates. The effects of ac Stark shifted and intensity broadened intermediate states on the emission processes have been investigated.
Author: S.L. Chin Publisher: Elsevier ISBN: 0323157556 Category : Science Languages : en Pages : 287
Book Description
Multiphoton lonization of Atoms provides a pedagogical review of the whole subfield of multiphoton ionization of atoms. This book discusses the "normal multiphoton ionization of atoms; calculation of resonant multiphoton processes; and angular distribution of photoelectrons and light polarization effects in multiphoton ionization of atoms. The multiphoton ionization involving continuum-continuum transitions; creation of doubly charged strontium ions; and many-electron processes in nonlinear ionization of atoms are also elaborated. Other topics include the non-resonant multiphoton ionization of atoms; above-threshold ionization theory; autoionizing states in multiphoton transitions; and specific features of the spectra of alkaline-earth atoms. This publication is beneficial to physics students and researchers conducting work on the multiple ionization of atoms.
Author: P. Lambropoulos Publisher: Springer Science & Business Media ISBN: 3642702007 Category : Science Languages : en Pages : 206
Book Description
The chapters of this volume represent the invited papers delivered at the 3rd International Conference on Multiphoton Processes (ICOMP III) held in Iraklion, Crete, Greece, September 5-11, 1984. The invited papers at a conference like ICOMP cannot possibly cover the whole field which has grown to immense proportions in recent years, overlapping with such diverse areas as atomic and molecular spectroscopy, plasma physics, nonlinear optics, quantum optics, etc. We believe these contributions represent that part of the research activity which has been attracting the most interest in the past year or so, as well as reviews of some of the more established topics. Even within this scope, and given the confines imposed by the fi nite duration of a conference, important and timely topics are inevitably left out. But then, there will be ICOMP IV. The collection of articles in this volume, combined with extensive ref erences to related work given by the authors, should provide an introduc tion to the major problems of the field and its state of the art. The chapters have been arranged according to thematic proximity, beginning with atoms, and continuing on with molecules and surfaces. This classi fication, however, would not cover all the subject matter even within the limited scope of the conference and of this volume.
Author: A. L'Huillier Publisher: Springer Science & Business Media ISBN: 1461579635 Category : Science Languages : en Pages : 494
Book Description
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).
Author: Richard M. More Publisher: Springer Science & Business Media ISBN: 1489915761 Category : Technology & Engineering Languages : en Pages : 476
Book Description
The aim of this NATO Advanced Study Institute was to bring together scientists and students working in the field of laser matter interactions in order to review and stimulate developmentoffundamental science with ultra-short pulse lasers. New techniques of pulse compression and colliding-pulse mode-locking have made possible the construction of lasers with pulse lengths in the femtosecond range. Such lasers are now in operation at several research laboratories in Europe and the United States. These laser facilities present a new and exciting research direction with both pure and applied science components. In this ASI the emphasis is on fundamental processes occurring in the interaction of short laser pulses with atoms, molecules, solids, and plasmas. In the case of laser-atom (molecule) interactions, high power lasers provide the first access to extreme high-intensity conditions above 10'8 Watts/em', a new frontier for nonlinear interaction of photons with atoms and molecules. New phenomena observed include multiphoton ionization processes, atomic collisions in the presence of a strong laser field, Coulomb explosion following rapid ionization of a molecule and the production of high harmonics of the laser source. Another important topic reviewed in this ASI is the lasercooling ofatoms.
Author: S. H. Lin Publisher: World Scientific ISBN: 9789971502898 Category : Science Languages : en Pages : 352
Book Description
In view of the rapid growth in both experimental and theoretical studies of multiphoton processes and multiphoton spectroscopy of atoms, ions, and molecules in chemistry, physics, biology and material sciences, this series contains review papers exploring the growth. They are readable not only by active researchers in these areas but also by those who are not experts in the field but intend to enter the field.
Author: P. M. Dehmer Publisher: ISBN: Category : Languages : en Pages : 16
Book Description
This report summarizes research on resonantly enhanced multiphoton absorption dissociation, and ionization processes in atoms and molecules. Multiphoton processes are studied using from one to three independently tunable visible and/or UV laser beams in order to establish both the underlying physics and the high degree of selectivity of multiphoton processes. Measurements are made to probe both the formation of excited molecular states and the subsequent behavior of excited states either in the presence or in the abscence of further intense laser radiation. Detection methods include laser-induced fluorescence, ion mass analysis, and electron energy analysis. During the current reporting period, we have studied resonant multiphoton ionization processes for the molecules N2, CO, O2, NO, NeXe, ArXe, KrXe, and Xe2 and for the atoms C, I, and S using both mass spectrometry and photoelectron spectroscopy to analyze the products of the ionizations. In addition, we are developing three new instruments that will provide significantly enhanced resolution, collection efficiency, and versatility in both the ion mass and the electron kinetic energy detection channels. Keywords include: double resonance spectroscopy, electron spectroscopy, molecular beams, rydberg states; photoelectron angular, distributions. (Author).
Author: Sheng-hsien Lin Publisher: World Scientific ISBN: 981450761X Category : Science Languages : en Pages : 326
Book Description
Contents:Two-Color Double Resonance Spectroscopy For the Study of High Excited States of Molecules (M Ito & M Fujii)Resonantly Enhanced Multiphoton Ionization — Photoelectron Spectroscopy as a Probe of Molecular Photophysics and Photochemistry (S Pratt, P Dehmer & J Dehmer)Progress in Resonance Enhanced Multiphoton Ionization Spectroscopy of Transient Free Radicals (J Hudgens)Time-Resolved Resonance Raman Spectroscopy: Intense Electromagnetic Field Effects, and Photoelectrochemical Reactions on Semiconductor Crystallite Surfaces (L Brus) Readership: Atomic physicists, chemists and materials scientists.
Author: K. C. Kulander
Author: K. C. Kulander
Author: S.L. Chin
Author: P. Lambropoulos
Author: A. L'Huillier
Author: Richard M. More
Author: S. H. Lin
Author: James Stevenson Keller
Author: P. M. Dehmer
Author: Philip H. Bucksbaum
Author: Sheng-hsien Lin