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Photodissociation of CH2BrCl at 248 and 193 nm investigated by translational spectroscopy

✍ Scribed by W.B. Tzeng; Y.R. Lee; S.M. Lin

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 449 KB
Volume: 227
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(94)00837-x

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✦ Synopsis

The photodissociation of CH2BrCl at 248 and 193 nm has been studied by translational spectroscopy. Both the product translational energy distribution and the anisotropy parameter were derived from the measured time-of-flight spectra. Results show that at 248 nm, CHzBrCl exclusively dissociates to CH&l+Br with average translational energy of 20 kcal/mol. On absorption of 193 nm photons, two different paths, ( 1) CH,BrCl+ CHsCl+ Br and (2) CH,BrCl-+ CHrBr + Cl, were detected with average translational energies of 32 and 24 kcal/mol, respectively. The branching ratio of reactions ( 1) / (2) was deduced as u 4.5. From the measured values of product anisotropy parameter at these two wavelengths, we conclude that reaction ( 1) occurs rapidly after excitation via an A'+A' transition.

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