Calculation of vibrational preionization in H/sub 2/ by multichannel quantum defect theory: Total and partial cross sections and photoelectron angular distributions

Journal Article · Sun Mar 15 00:00:00 EST 1981 · J. Chem. Phys.; (United States)

OSTI ID:6616843

Raoult, M; Jungen, C

Multichannel quantum defect theory has been used to calculate the effect of vibrational preionization on the total and partial oscillator strength distributions and photoelectron angular distribution in H/sub 2/ for excitation between 790 and 760 A. The total oscillator-strength distribution obtained agrees well with the high-resolution photoionization data of Dehmer and Chupka. The partial oscillator strength resonance profiles are predicted to have different shapes in different vibrational ionization channels, while their widths change little with channel. The preionization resonances are also predicted to affect the angular distribution asymmetry parameters ..beta.. over a broader range than they affect the oscillator strength distribution. The gross features of the preionization resonances are discussed in terms of approximate solutions of the MQD equations.

• Research Organization: Laboratoire de Photophysique Moleculaire du C.N.R.S., Universite de Paris-Sud, 91405 Orsay, France
• OSTI ID: 6616843
• Journal Information: J. Chem. Phys.; (United States), Vol. 74:6
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HYDROGEN
PHOTOIONIZATION
ANGULAR DISTRIBUTION
DISTRIBUTION
OSCILLATOR STRENGTHS
SPECTRA
TOTAL CROSS SECTIONS
VIBRATIONAL STATES
CROSS SECTIONS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
IONIZATION
NONMETALS
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory