Laser-induced fluorescence spectroscopy of the ketenyl radical
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551 (United States)
- Department of Chemistry, University of California, Berkeley, California 94720 (United States)
We report the first laser-induced fluorescence (LIF) excitation spectrum of the ketenyl radical, HCCO, which is produced by the 193 nm photolysis of ketene in a free jet expansion. A series of vibronic bands in the {tilde B}{sup 2}{Pi}{endash}{tilde X}{sup 2}A{sup {prime}{prime}} system are observed. The LIF band positions and rotational structures are in excellent agreement with those of a recent photofragment yield (PFY) spectrum [D. L. Osborn {ital et al.}, J. Chem. Phys. (to be published)] from the origin at 33424 cm{sup {minus}1} to 35100 cm{sup {minus}1}. At higher energies the LIF spectrum breaks off sharply due to a rapid increase in the rate of predissociation. The lifetime of the vibrationless level of the {tilde B} state is less than 1 ns; the estimated quantum yield of fluorescence is {approximately}10{sup {minus}3}. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 548836
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 2 Vol. 107; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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