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Primary processes in the 147-nm photolysis of 1,1-dichloroethane

✍ Scribed by D. Salomon; A. W. Kirk; E. Tschuikow-Roux

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 538 KB
Volume: 9
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550090410

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✦ Synopsis

The room temperature photolysis of 1,l-dichloroethane at 147 nm in the pressure range of 1.34-196.2 torr is characterized almost entirely by the molecular elimination of HCl, Cl,, and small quantities of HD.

While it is possible that the C2HD arises, in part, from the decomposition of vibrationally excited ground states of C,H,Cl and/or CZHl, in this particlar case serious consideration has to be given to alternative explanations where the products of the primary processes are formed in electronically excited states. The 01,a elimination of molecular chlorine is not inconsistent with an increased degree of Cl-Cl interaction predicted for a "Rydberg" state of 1,1-C2HaCl,. Varying small yields of CH, are observed in the presence and absence of NO. The effect of large pressures of CF, on the quantum yields of the major products is extremely small. The extinction coefficient for 1,1-C2H,C1, at 147 nm and 296°K is 246 f 29 cm-'.atm-'.

Acetylene is also produced.

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