High resolution pulsed field ionization-photoelectron study of CO{sub 2}{sup +}(X {sup 2}{pi}{sub g}) in the energy range of 13.6-14.7 eV

Journal Article · Thu Jun 22 04:00:00 EDT 2000 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.481721· OSTI ID:20216752

Liu, Jianbo ^[1]; Chen, Wenwu ^[1]; Hsu, C -W ^[1]; Hochlaf, M ^[2]; Evans, M ^[3]; Stimson, S ^[3]; Ng, C Y ^[3]

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1. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
2. Theoretical Chemistry Group, University of Marne-La-Vallee, Champs Sur Marne F-77454, Marne-La-Vallee, Cedex 2, (France)
3. Ames Laboratory, USDOE (United States)

The vacuum ultraviolet pulsed field ionization-photoelectron (PFI-PE) spectra for CO{sub 2} have been measured in the energy range of 13.6-14.7 eV, revealing complex vibronic structures for the ground CO{sub 2}{sup +}(X {sup 2}{pi}{sub g}) state. Many vibronic bands for CO{sub 2}{sup +}(X {sup 2}{pi}{sub g}), which were not resolved in previous photoelectron studies, are identified in the present measurement based on comparison with available optical data and theoretical predictions. As observed in the HeI photoelectron spectrum of CO{sub 2}, the PFI-PE spectrum is dominated by the symmetry allowed {nu}{sub 1}{sup +} (symmetric stretch) vibrational progression for CO{sub 2}{sup +}(X {sup 2}{pi}{sub g}). However, PFI-PE vibronic bands due to excitation of the symmetry disallowed {nu}{sub 2}{sup +} (bending) and {nu}{sub 3}{sup +} (asymmetric stretch) modes with both odd quanta, together with the symmetry allowed even quanta excitations, are clearly discernible. The simulation of rotational contours resolved in PFI-PE vibronic bands associated with excitation to the ({nu}{sub 1}{sup +}=0-1, {nu}{sub 2}{sup +}=0-2, {nu}{sub 3}{sup +}=0) vibrational levels has yielded accurate ionization energies for the formation of these vibronic states from CO{sub 2}(X {sup 1}{sigma}{sub g}{sup +}). (c) 2000 American Institute of Physics.

• OSTI ID: 20216752
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 24 Vol. 112; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CARBON DIOXIDE
CATIONS
ELECTRONIC STRUCTURE
EV RANGE 10-100
EXPERIMENTAL DATA
IONIZATION
PHOTOELECTRON SPECTROSCOPY
ROTATIONAL STATES
VIBRATIONAL STATES