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Laser-induced fluorescence spectra and the observation of quantum beats in the à 2Πi−X̃ 2Πi transition of the HCCS radical

✍ Scribed by Hiroshi Kohguchi; Yasuhiro Ohshima; Yasuki Endo

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
433 KB
Volume
254
Category
Article
ISSN
0009-2614

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✦ Synopsis

LIF spectra of the ,g, 2I-I~-X 2H~ transition of the HCCS radical were observed in a supersonic jet generated by using a pulsed-discharge nozzle. Adiabatic cooling yielded definitive rotational assignments for = 40 vibronic bands. The fluorescence from single rovibronic levels exhibited a quantum beat in most of the observed bands. The number of beat components increased gradually with internal energy, approaching the limiting case for a 'large molecule'. The observed quantum interference is ascribed, based on the estimated densities of background states, to the internal conversion coupling with highly excited vibrational levels in the X 21-I i state.

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