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was also investigated. It was found that there was no effect on SF6 suggests that the dimethylsilaethene is formed initially in a vibrationally excited state: Me2SiCH2CH2CH2 + hv -Me2SiCH2v + CH2 = CH2. Laser pulsed photolysis experiments at 193 nm have been carried out to measure the absorption spectrum of Me2SiCH2, its absorption cross section, and the rate constant for Me2SCH2 combination: 2Me2SiCH2 -*• (Me2SiCH2)2. The values obtained are a (240 nm, base e) = (1.0 0.2) X 10~17 cm2 and k7 = (3.3 ± 0.8) X 10"11 cm3s"1. The kinetics of the pyrolysis of Me2SiCH2CH2CH2 have also been reexamined, yielding the following rate constant expressions: k\¡{s"1) = io15-46±0•13 exp(-(31043 ± 218)/7) and k_f kJ!2 / (crcy'l2 s"1/2) = 10"70±0'3 exp(-(7850 ± 300)/ ').From these results, the heat of formation, -bond energy, and entropy, of Me2SiCH2, have been deduced: *{g, 298 K

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