Spectroscopic and kinetic studies of the SO radical and the photolysis of thionyl chloride
- 1 January 1969
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 65, 2930-2940
- https://doi.org/10.1039/tf9696502930
Abstract
The primary processes occurring in the photolysis of SOCl2 have been examined using kinetic absorption spectroscopy in the ultra-violet and vacuum ultra-violet. Photodissociation involves the fission of one sulphur-chlorine bond, leaving an energized SOCl radical which may then undergo unimolecular decomposition to yield an SO radical and a further chlorine atom, or is stabilized by collision. The kinetics of the SO radical so formed are examined and a mechanism for removal is proposed. Two new electronic states of the SO radical are identified via new absorption systems in the vacuum ultra-violet designated SO(D3IIâ†�X3∑–) and SO(E3IIâ†�X3∑–). The D and E states are successive members of a Rydberg series and yield an approximate value for the first ionization potential of SO as 10.0 ± 0.1 eV. Molecular constants for the two states are given as [graphic omitted] The extinction coefficient of the (7,0) band for the transition SO(B3∑–â†�X3∑–) is determined as 8.0 ± 1.5 × 106 cm2 mol–1.Keywords
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