✦ LIBER ✦

Branching ratio for the H + NCO channel in the 193 nm photodissociation of HNCO

✍ Scribed by R.A. Brownsword; T. Laurent; R.K. Vatsa; H.-R. Volpp; J. Wolfrum

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 361 KB
Volume: 249
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)01409-8

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✦ Synopsis

The H atom quantum yield ~b H and the average product translational energy were determined for the HNCO ---, H(2S) + NCO(X 21-I) photodissociation channel at room temperature for a photolysis wavelength of 193 nm. HNCO was photolyzed using an ArF excimer laser and nascent H atoms were detected by vacuum-UV-laser-induced fluorescence at the Lyman-ct transition. With a calibration method using HCI photolysis as a source of well-defined H atom concentrations, a value of ~brt = 0.20 + 0.04 for the H atom quantum yield was measured. From H atom Doppler profiles, measured under single collision conditions, the fraction fr of the available energy released as product translational energy was determined to be f-r(H + NCO) = 0.69 + 0.09.

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