IR AND UV LASER-INDUCED PHOTOLYSIS OF 2-CHLOROETHENYLSILANE

The laser-induced decomposition of 2-chloroethenylsilane was studied i n the IR with a TEA CO2 laser and in the UV with a narrow-band, freque ncy-doubled dye laser at 212.5 nm. Silylene was observed in the LR mul tiphoton dissociation (MPD) via laser-induced fluorescence (LIE). The nascent silylene fragments are vibrationally excited in the bending mo de. Multiphoton UV photolysis yields a fluorescence emission spectrum originating from the SiH (A(2) Delta --> (XII)-I-2) Delta upsilon = 0 system, with several atomic Si transitions and molecular bands corresp onding to C-2 (d(3)II(g) --> a(3)II(u)) Delta upsilon = 2, 1, 0, -1 an d -2 transitions. The simulation of the spectra originating from diato mic fragments indicates that these possess a high content of internal energy, A high population of Si triplet states is observed. (C) 1997 E lsevier Science S.A.