Shape resonance and non-Franck--Condon effects in (2+1) resonant enhanced multiphoton ionization of O/sub 2/ via the C /sup 3/Pi/sub g/ state

Journal Article · Sun Jan 15 04:00:00 EST 1989 · J. Chem. Phys.; (United States)

OSTI ID:6574941

Braunstein, M; Stephens, J A; McKoy, V

We report vibrationally resolved photoelectron angular distributions for photoionization of the C /sup 3/Pi/sub g/ Rydberg state of O/sub 2/. Comparison is made with recent experimental measurements of angular distributions which employ (2+1) resonant enhanced multiphoton ionization of the C /sup 3/Pi/sub g/ state. The present theory treats the process as single-photon ionization from an unaligned Rydberg state, and qualitatively accounts for much of the observed trends. Non-Franck--Condon effects induced by the ksigma/sub u/ shape resonance lead to a substantial dependence of the angular distributions on the vibrational state of the X /sup 2/Pi/sub g/ ion. Discrepancies between our theoretical results and experiment are qualitatively discussed and tentatively attributed to residual electron correlations.

• Research Organization: Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
• OSTI ID: 6574941
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 90:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
CORRELATIONS
DISTRIBUTION
ELECTRON CORRELATION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
EXCITED STATES
IONIZATION
MULTI-PHOTON PROCESSES
NONMETALS
OXYGEN
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RYDBERG STATES
SPECTROSCOPY