Laser-induced fluorescence spectroscopy of the ketenyl radical

Autor:	Eric A. Rohlfing, Ryan T. Bise, Daniel M. Neumark, L. R. Brock, B. Mischler
Rok vydání:	1997
Předmět:	chemistry.chemical_compound Chemistry Radical Yield (chemistry) Photodissociation General Physics and Astronomy Ketene Quantum yield Physical and Theoretical Chemistry Atomic physics Fluorescence Fluorescence spectroscopy Excitation
Zdroj:	The Journal of Chemical Physics. 107:665-668
ISSN:	1089-7690 0021-9606
Popis:	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 B 2Π–X 2A′′ 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 et al., J. Chem. Phys. (to be published)] from the origin at 33 424 cm−1 to 35 100 cm−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 B state is less than 1 ns; the estimated quantum yield of fluorescence is ∼10−3.
Databáze:	OpenAIRE
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