Abstract
The mechanism of pyrolysis of monosilane in the light of recent work by Robertson, Hils and Gallagher (RHG). It is argued that at reactant pressures 40 Torr, and at temperatures 650 K, the reaction is initiated homogeneously by the unimolecular process SiH 4 → SiH 2 + H 2, as originally proposed by us, but contrary to RHG's interpretation. At low pressures, however, the reaction may well be surface initiated. In the secondary stages of decomposition we discuss possible chain branching processes involving silylenes and point out continuing mechanistic difficulties.
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