Braunstein, M. and McKoy, V. (1989) Shape resonance behavior in 1π_g photoionization of O_2. Journal of Chemical Physics, 90 (5). pp. 2575-2579. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:20120531-065532856
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We report calculations of vibrationally resolved cross sections and photoelectron angular distributions for photoionization of O_2 leading to the X^ 2 Π_g (ν^+ =0–4) states of O^+_2 using Hartree–Fock continuum photoelectron orbitals. These studies were motivated by recent results which show that a σ_u shape resonance plays a dominant role in producing non‐Franck–Condon vibrational distributions in resonant multiphoton ionization of O_2 via the C ^3Π_g (1π_g3sσ_g) Rydberg state. In the present study, we investigate how this shape resonance influences photoionization dynamics in single‐photon ionization. Below 21 eV photon energy, we find significant non‐Franck–Condon effects in the vibrational branching ratios as well as in the vibrationally resolved photoelectron angular distributions. Substantial autoionization hinders a direct comparison between theory and experiment.
|Additional Information:||© 1989 American Institute of Physics. Received 10 October 1988; accepted 9 November 1988. This material is based upon research supported by the National Science Foundation under Grant No. CHE85-21391. The authors acknowledge use of the resources of the San Diego SuperComputer Center which is supported by the National Science Foundation. The authors also thank Dr. J. A. Stephens for helpful discussions and suggestions.|
|Subject Keywords:||PHOTOIONIZATION, MULTI−PHOTON PROCESSES, OXYGEN, RYDBERG STATES, VIBRATIONAL STATES, RESONANCE, PHOTOELECTRON SPECTROSCOPY, ANGULAR DISTRIBUTION, CROSS SECTIONS, BRANCHING RATIO|
|Classification Code:||PACS: 33.60.+q; 33.80.Rv; 33.20.Tp|
|Official Citation:||Shape resonance behavior in 1πg photoionization of O2 M. Braunstein and V. McKoy J. Chem. Phys. 90, 2575 (1989); http://dx.doi.org/10.1063/1.455954|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||31 May 2012 15:21|
|Last Modified:||26 Dec 2012 15:17|
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