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Laser assisted charge transfer reactions in slow ion–atom collisions: Coupled dressed quasimolecular-states approach

J. Chem. Phys. 81, 788 (1984); doi:10.1063/1.447712

Issue Date: 15 July 1984

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Tak-San Ho, Shih-I Chu, and Cecil Laughlin
Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-2112
Semiclassical coupled dressed quasimolecular states (DQMS) approaches are presented for the nonperturbative treatment of charge transfer reactions at low collision velocities and high laser intensities. The DQMS are first obtained via the Floquet theory. The laser assisted collision process can then be treated as the electronic transitions among the DQMS driven by the nuclear motion only. The expansion of the total electronic wave function in a truncated DQMS basis results in a set of coupled adiabatic equations. The adiabatic DQMS and their associated quasienergies (depending parametrically upon the internuclear separation R) exhibit regions of avoided crossings, where the electronic transition probabilities are large due to strong radial couplings induced by the nuclear movement. By further transforming the adiabatic DQMS into an appropriate diabatic DQMS representation, defined via the vanishing of the aforementioned radial couplings, we obtain a new set of coupled diabatic equations which offer computational advantage. The method is illustrated by a case study of the laser assisted charge exchange process He+++H(1s)+[h-bar]omega-->He+(n=2)+H+, in a two-state approximation, for the velocity range from 1.5×105 to 2×107 cm/s and for the laser intensity in the range of 0.4 to 4.0 TW/cm2. Results of exact coupled diabatic DQMS calculations are presented along with several approximation calculations, using first order perturbation theory, the Magnus approximation, and the average cross section. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 1 March 1984; accepted 6 April 1984
Permalink: http://link.aip.org/link/?JCPSA6/81/788/1
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KEYWORDS and PACS

Keywords
PACS
  • 34.70.+e
    Atomic and molecular collision processes and interactions Charge transfer
  • 82.30.Fi
    Physical chemistry Specific chemical reactions; reaction mechanisms Ionmolecule, ionion, and charge-transfer reactions
  • YEAR: 1984

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
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