US EPA

6152177 

Journal Article 

The 147 nm photodecomposition of methysilane 

Lampe, FW; Longeway, PA 

1980 

0 

Journal of Photochemistry
ISSN: 0047-2670
EISSN: 1873-2658 

14 

4 

311-322 

10.1016/0047-2670(80)85103-3 

http://www.sciencedirect.com/science/article/pii/0047267080851033
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The photodecomposition of methylsilane at 147 nm results in the formation of hydrogen, methane, ethane, dimethylsilane, methyldisilane, dimethyldisilane and a solid deposit on the walls of the vessel. Six primary processes are required to explain the experimental results. These are as follows, with the primary quantum yields given in parentheses: The excess energies of the photodissociations, which must be disposed of by the products of the primary processes, are very large, ranging from 42 to 150 kcal mol−1, so that without doubt the products of the primary processes are internally excited. It is shown specifically that methyl radicals from reaction (b) react some 140 times faster with methylsilane than do methyl radicals without excess internal energy. A mechanism involving further reactions of the products of the primary processes is proposed which is in accord with the experimental facts.