ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The photodissociation spectroscopy and dynamics of the CH3S and CD3S radicals have been investigated using fast radical beam photofragment spectroscopy of the A˜ 2A1←X˜ 2E electronic band (T0≅26 400 cm−1) and an unstructured band near 45 600 cm−1. At all energies, only one major channel, CH3(X˜ 2A2″)+S(3Pj), was observed. Photofragment yield spectra for the A˜ 2A1←X˜ 2E electronic band show resolved vibrational progressions extending well beyond those seen in laser-induced fluorescence studies of this band. Photofragment translational energy distributions yield the S(3Pj) fine-structure distribution for each vibrational level of the CH3 product. Photofragment angular distributions were found to be highly anisotropic (β=−0.2 to −1.0±0.1) with increasing anisotropy at higher photon energies. The results yield a refined heat of formation for CH3S (1.346±0.018 eV) as well as the mechanism by which the A˜ 2A1 state is predissociated. Results at 45 600 cm−1 imply that dissociation occurs on the repulsive B˜ 2A2 state. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.478048
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