Shape resonance effects in the rotationally resolved photoelectron spectra of O sub 2

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.459654· OSTI ID:6333379

Braunstein, M; McKoy, V ^[1]; Dixit, S N ^[2]; Tonkyn, R G; White, M G ^[3]

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1. Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA (USA)
2. Theoretical Atomic and Molecular Physics Group, Lawrence Livermore National Laboratory, Livermore, CA (USA)
3. Chemistry Department, Brookhaven National Laboratory, Upton, NY (USA)

We report the results of theoretical and experimental studies of the rotationally resolved photoelectron spectra of O{sub 2} at low temperature leading to the {ital v}{sup +}=0, 1, and 2 levels of the {ital X} {sup 2}{Pi}{sub {ital g}} state of O{sup +}{sub 2}. A delayed, pulsed field ionization technique is used in conjunction with a coherent VUV radiation source to obtain high resolution spectra near threshold. The data are compared with theoretical results obtained using static-exchange photoelectron orbitals and a full description of the mixed Hund's case (a)--(b) ionic ground state. Agreement with experiment is good, especially for the {ital v}{sup +}=1 and {ital v}{sup +}=2 levels. Analysis of the rotational branch intensities yields detailed information on the angular momentum composition of the shape resonance near threshold. We also show that the dependence of the electronic transition moment on internuclear distance caused by the shape resonance leads to a significant dependence of the rotational branch intensity on ion vibrational level.

• DOE Contract Number: W-7405-ENG-48; FG03-87ER60513; AC02-76CH00016
• OSTI ID: 6333379
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 93:7; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
EXCITED STATES
IONIZATION
NONMETALS
OXYGEN
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RESOLUTION
RESONANCE
ROTATIONAL STATES
RYDBERG STATES
SPECTROSCOPY
TRANSITION AMPLITUDES