Table of Contents
Laser Chemistry
Volume 16, Issue 4, Pages 207-218

HCL(B1+) and HBr(B1+) Emission From the Ultraviolet Multiphoton Dissociation of Vinyl Chloride and Bromide

Instituto de Química Física “Rocasolano”, CSIC, Serrano 119, Madrid 28006, Spain

Received 17 October 1995

Copyright © 1996 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Multiphoton dissociation processes of vinyl chloride and bromide were studied with a broadband ArF laser at 193 nm and with a narrowband tunable laser in the region of 212 nm, in the peak and in the threshold of the absorption band, respectively, for both compounds. Photolysis at 193 nm gives rise to the corresponding hydrogen halide in the B1+ excited state which results in an intense UV emission. However these emissions are absent when photodissociation was performed with the narrow band dye laser around 212 nm. These results, together with a calculation of the observed spectra, give further support to a mechanism which invokes one-photon resonant absorption of vibrationally hot ground state hydrogen halide as the process which populates the excited B1+ state of the fragment.