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State-specific photofragment yield spectroscopy of jet-cooled methyl nitrite

✍ Scribed by S.A. Reid; J.T. Brandon; H. Reisler

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 646 KB
Volume: 209
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)87195-9

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✦ Synopsis

We obtained state-specific photofragment yield (PHOFRY) spectra of jet-cooled CH,ONO in the S, -So absorption system by monitoring selected rotational levels in NO u= 0, 1 and 2. The spectra exhibit bands which are assigned to both the syn-and antirotamers with origins at 380 nm and 388 nm, respectively. All the bands are broad (500-800 cm-' ) suggesting that the dissociation lifetimes are shorter than those obtained in dynamical calculations on model potential energy surfaces. The widths do not depend on the monitored NO rotational level. The results support a mechanism where nonadiabatic vibrational predissociation is preferred.

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Photofragment yield spectra of jet-cooled CH,ONO are measured over the first few resonances of the SltSo absorption by monitoring the NO fragments via selected rotational levels in each of the four sublevels F, (A', A") and F\*(A', A") of the vibrational states v"=O, 1 and 2. Based on spectral featu