Abstract
Rate constants for the reactions of H atoms, formed by mercury photosensitization of H/sub 2/-substrate mixtures at 32/sup 0/C, with (CH/sub 3//sub n/SiH/sub 4-n/ and (C/sub 2/H/sub 5/)/sub n/SiH/sub 4-n/ for n = 0, 1, 2, 3; with (CH/sub 3/)/sub n/SiD/sub 4-n/ for n = 0, 1; and with Si/sub 2/H/sub 6/, Si/sub 2/D/sub 6/, GeH/sub 4/, and Ge/sub 2/H/sub 6/ have been determined in experiments involving the competitive reaction of H atoms with C/sub 2/H/sub 4/ and i-C/sub 4/H/sub 8/. Activation energies, estimated from these rate constants, have been combined with thermochemical data by means of a bond-energy-bond-order (BEBO) method of calculation to yield a consistent set of dissociation energies for Si--H bonds in the R/sub n/SiH/sub 4-n/ series of silanes for n = 0, 1, 2, 3.
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