Photoionization of the EF excited state of H/sub 2/: Calculation of vibrational branching ratios and photoelectron angular distributions
Vibrational branching ratios and photoelectron angular distributions have been calculated for photoionization from the lowest vibrational levels of the EF state in H/sub 2/. The Rydberg-continuum dipole transition moments have been evaluated in the Coulomb approximation and the oscillator strengths have been calculated with the multichannel quantum defect method. Rovibronic coupling between continuum final-state channels has been included and rotational/vibrational preionization is also accounted for where it arises. Only minor deviations from the Franck--Condon principle are predicted, primarily related to the promotion of the psigma/sub u/ Rydberg (continuum) orbital. This result disagrees somewhat with the (2+1) REMPI experiment of Anderson, Kubiak, and Zare (1984) near 18.5 eV. On the other hand, the results obtained in a (4+1) REMPI experiment by Cornaggia et al. (1986) at 15.7 eV are correctly reproduced. The possible influence of doubly excited configurations on the photoelectron distributions in various REMPI experiments in H/sub 2/ is discussed.
- Research Organization:
- Service de Physique des Atomes et des Surfaces, Centre d'Etudes Nucleaires de Saclay, 91191-GiF sur Yvette Cedex, France
- OSTI ID:
- 6207907
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 87:7; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
BRANCHING RATIO
DISTRIBUTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
IONIZATION
NONMETALS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
SPECTROSCOPY
VIBRATIONAL STATES