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Effect of laser intensity on (2+1)-photon ionization of the hydrogen molecule via the E,F /sup 1/. sigma. /sub g/ state

Journal Article · · Phys. Rev. A; (United States)
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We have studied theoretically the effect of laser intensity on (2+1)-photon resonance-enhanced multiphoton ionization of the H/sub 2/ molecule via both the inner-well and the outer-well vibrational levels of the double-minimum E,F /sup 1/..sigma../sub g/ state. The branching ratios for the vibrational distribution of the H/sub 2//sup +/ ion, the photoelectron angular distribution, and the corresponding asymmetry parameters have been calculated as functions of laser intensity ranging from 10/sup 7/ W/cm/sup 2/ to 5 x 10/sup 9/ W/cm/sup 2/ (peak intensity). For ionization via the vibrational levels v/sub E/ of the inner well, it has been found that the branching ratios depend on laser intensity, the peak of the distribution being at ..delta..v = 0, i.e., v/sub E/ = v/sub ion/ transition, and our results are in good agreement with experiment. For ionization via the outer-well levels v/sub F/ we have shown that the lower the value of v/sub F/, the more the ion yield is shifted towards higher v/sub ion/ levels. We find that the photoelectron angular distribution remains unchanged over the whole intensity range studied in this work.

Research Organization:
Atomic and Molecular Physics Section, Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700chemically bond032, West Bengal, India
OSTI ID:
6967367
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 38:2; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ASYMMETRY
BRANCHING RATIO
CROSS SECTIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
HYDROGEN
IONIZATION
LASER RADIATION
MOLECULES
MULTI-PHOTON PROCESSES
NONMETALS
PHOTOIONIZATION
RADIATIONS
RESONANCE
VIBRATIONAL STATES