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Impulsive excitation of coherent vibrational motion ground surface dynamics induced by intense short pulses

J. Chem. Phys. 101, 8461 (1994); doi:10.1063/1.468108

Issue Date: 15 November 1994

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Uri Banin, Allon Bartana, Sanford Ruhman, and Ronnie Kosloff
Department of Physical Chemistry and the Fritz Haber and Farkas Research Centers, the Hebrew University, Jerusalem 91904, Israel
A framework for understanding impulsively photoinduced vibrational coherent motion on the ground electronic surface is presented. In particular strong resonant excitation to a directly dissociative electronic surface is considered. Three distinct approaches are employed. A two surface Fourier wavepacket method explicitly including the field explores this process in isolated molecules. A coordinate dependent two-level system is employed to develop a novel analytical approximation to the photoinduced quantum dynamics. The negligible computational requirements make it a powerful interactive tool for reconstructing the impulsive photoexcitation stage. Its analytical nature provides closed form expressions for the photoinduced changes in the material. Finally the full simulation of the process including the solvent effects is carried out by a numerical propagation of the density operator. In all three techniques the excitation field is treated to all orders, allowing an analysis of current experiments using strong fields, resulting in substantial photoconversion. The emerging picture is that the impulsive excitation carves a coherent dynamical ``hole'' out of the ground surface density. A rigorous definition of the dynamical ``hole'' is constructed and used to define a measure of its coherence. In particular all photoinduced time dependence in the system can be directly related to the dynamical ``hole.'' All three techniques are used to simulate the pump probe experiment on the symmetric stretch mode of I<sub>[bold 3]</sub><sup>[bold - ]</sup>, including electronic and vibrational dephasing. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 22 October 1993; accepted 10 August 1994
Permalink: http://link.aip.org/link/?JCPSA6/101/8461/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.50.Hz
    Optics Quantum optics Strong-field excitation of optical transitions in quantum systems; multi-photon processes; dynamic Stark shift
  • 42.50.Md
    Optics Quantum optics Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, and optical nutation
  • 82.90.+j
    Physical chemistry Other topics in physical chemistry
  • YEAR: 1994

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0021-9606 (print)   1089-7690 (online)
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