The vinyl radical ({tilde A}{sup 2}A{sup {double_prime}}{l_arrow}{tilde X}{sup 2}A{sup {prime}}) spectrum between 530 and 415 nm measured by cavity ring-down spectroscopy
Journal Article
·
· Journal of Chemical Physics
- Department of Chemistry, American University, 4400 Massachusetts Avenue NW, Washington, DC 20016-8014 (United States)
- Combustion Research Facility, Sandia National Laboratory, Livermore, California 94551-0969 (United States)
- Department of Chemistry, Howard University, Washington, DC 20059 (United States)
High resolution (0.008 nm) transient absorption spectra have been measured for the vinyl radical (C{sub 2}H{sub 3}) {tilde A}{sup 2}A{sup {double_prime}}{l_arrow}{tilde X}{sup 2}A{sup {prime}} transition between 530 and 415 nm using cavity ring-down laser absorption spectroscopy. This is over 200 times better resolution than the only previous recorded spectrum of vinyl in this wavelength region by Hunziker, Kneppe, McLean, Siegbahn, and Wendt [Can J. Chem. {bold 61}, 993 (1983)]. With the improved resolution in the present study, new vibrational bands are detected, and some rotational structure of the bands is resolved. A calculation of the envelope of the origin band was carried out, using a model for a {ital c}-type transition of an asymmetric top. For a best fit to the data, the model requires a 1 cm{sup {minus}1} Lorentzian linewidth, which suggests a short-lived excited state. {copyright} {ital 1999 American Institute of Physics.}
- OSTI ID:
- 292707
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 4 Vol. 110; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:456881
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