Author: Jim-son Johnson ChouPublisher:
ISBN:
Category : Infrared sources
Languages : en
Pages : 412
Book Description
Two Dynamical Aspects of Infrared Laser Multiphoton Dissociation of Polyatomic Molecules
Author: Jim-son Johnson ChouPublisher:
ISBN:
Category : Infrared sources
Languages : en
Pages : 412
Book Description
Multiple-Photon Excitation and Dissociation of Polyatomic Molecules
Author: Cyrus D. CantrellPublisher: Springer Science & Business Media
ISBN: 3642822924
Category : Science
Languages : en
Pages : 300
Book Description
In the early 1970s, researchers in Canada, the Soviet Union and the United States discovered that powerful infrared laser pulses are capable of dissociating mole cules such as SiF4 and SF6' This result, which was so unexpected that for some time the phenomenon of multiple-photon dissociation was not recognized in many cir cumstances in which we now know that it occurs, was first publicized at a time when the possibility of using lasers for the separation of isotopes had attracted much attention in the scientific community. From the mid-1970s to the early 1980s, hun dreds of experimental papers were published describing the multiple-photon absorp tion of C02 laser pulses in nearly every simple molecule with an absorption band in the 9 - 11 jJm region. Despite this impressive volume of experimental results, and despite the efforts of numerous theorists, there is no agreement among re searchers in the field on many fundamental aspects of the absorption of infrared laser light by polyatomic molecules. This book is devoted to reviells of the experimental and theoretical research that provides the foundations for our current understanding of molecular multiple photon exc itat i on, and to rev i ews of research that is pert i nent to the 1 aser sep aration of isotopes.
Multiphoton Dissociation of Polyatomic Molecules
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The dynamics of infrared multiphoton excitation and dissociation of SF6 was investigated under collision free conditions by a crossed laser-molecular beam method. In order to understand the excitation mechanism and to elucidate the requirements of laser intensity and energy fluence, a series of experiments were carried out to measure the dissociation yield dependences on energy fluence, vibrational temperature of SF6, the pulse duration of the CO2 laser and the frequency in both one and two laser experiments. Translational energy distributions of the SF5 dissociation product measured by time of flight and angular distributions and the dissociation lifetime of excited SF6 as inferred from the observation of secondary dissociation of SF5 into SF4 and F during the laser pulse suggest that the dynamics of dissociation of excited molecules is dominated by complete energy randomization and rapid intramolecular energy transfer on a nanosecond timescale, and can be adequately described by RRKM theory. An improved phenomenological model including the initial intensity dependent excitation, a rate equation describing the absorption and stimulated emission of single photons, and the unimolecular dissociation of excited molecules is constructed based on available experimental results. The model shows that the energy fluence of the laser determines the excitation of molecules in the quasi-continuum and the excess energy with which molecules dissociate after the laser pulse. The role played by the laser intensity in multiphoton dissociation is more significant than just that of overcoming the intensity dependent absorption in the lowest levels. 63 references.
Advances in Multi-photon Processes and Spectroscopy
Author: S. H. LinPublisher: World Scientific
ISBN: 9789971966171
Category : Science
Languages : en
Pages : 536
Book Description
Theoretical Aspects of Laser Radiation and Its Interaction with Atomic and Molecular Systems
Author: Mechanisms of Multiphoton Dissociation of Molecular Ions
Author: Michael J. CoggiolaPublisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
The dynamics of multiphoton absorption and dissociation of polyatomic ions will be studied to characterize the details of the process. Ion fragments will be identified and the energy released into translation will be measured using a coaxial laser ion beam spectrometer. Single photon absorption studies of positive and negative polyatomic ions failed to reveal any vibrational absorptions in the infrared region investigated. A single photon electronic transition absorption in O2(+) was found which resulted in dissociation. (Author).
American Doctoral Dissertations
Author: Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 540
Book Description
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 826
Book Description
Quantum Mechanics in Mathematics, Chemistry, and Physics
Author: Karl GustafsonPublisher: Springer Science & Business Media
ISBN: 1461332583
Category : Technology & Engineering
Languages : en
Pages : 496
Book Description
Advances In Multi-photon Processes And Spectroscopy, Vol 1
Author: Sheng-hsien LinPublisher: World Scientific
ISBN: 9814508047
Category : Science
Languages : en
Pages : 524
Book Description
Contents:Atomic Multiphoton Processes (J H Eberly & J Ktsdindki)Studies on Laser Multiphoton Ionization and Multiphoton Ionization Dissociation of Polyatomic Molecules (D A Gobeli, J J Yang & M A El-Sayed)Laser-Induced Molecular Dynamics: Rate Processes in the Gas Phase and at Solid Surfaces (J T Lin, M Hutchinson & T F George)Multiphoton Processes by Visible and UV Lasers (I Tanaka & M Kawasaki)Applications of Raman Spectroscopy to Structural and Conformational Problems (J Laane)Theory of Laser-Stimulated Surface Processes: Master Equation Approach (B Fain, A R Ziv, G S Wu & S H Lin) Readership: Atomic physicists, chemists and materials scientists.