# LASER INDUCED FLUORESCENCE SPECTROSCOPY OF THE KETENYL RADICAL

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 Title: LASER INDUCED FLUORESCENCE SPECTROSCOPY OF THE KETENYL RADICAL Creators: Brock, L. R.; Rohlfing, Eric A.; Mischler, B. Issue Date: 1999 Publisher: Ohio State University Abstract: The ketenyl radical, HCCO, is widely recognized as a critical reaction intermediate in hydrocarbon combustion. In order to enable laser-based diagnostics of ketenyl in combustion and kinetics environments, we have examined the electronic spectroscopy of the $B ^{2}II - X^{2} A$'' band system of H(D)CCO using laser-induced florescence in a free-jet environment. We obtain both vibronically resolved excitation spectra and fully rotationally resolved spectra for the origin band and for four bands terminating on levels of $\Sigma$ vibronic symmetry, which are assigned to the two pairs of $\Sigma$ states derived from one quantum of excitation in each of the Renner-Teller active modes, the CCO and CCH(D) bend. In addition to the Renner-Teller and spin-orbit couplings, there is substantial evidence for additional perturbations among the low-lying bending levels in the first excited state of ketenyl. Description: $^{a}$ This work supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences Author Institution: Combustion Research Facility, Sandia National Laboratories, Livermore, CA; Paul Scherrer Institut, Ch-5232, Viligen PSI, Switzerland. URI: http://hdl.handle.net/1811/19251 Other Identifiers: 1999-MF-13