Abstract

The decomposition mechanism of SiH 2( 1B 1) formed after IR multiple-photon dissociation of SiH 4 has been investigated by simultaneous acquisition of spontaneous chemiluminescence of SiH 2 radicals and state-selective two-photon laser-induced fluorescence spectra of the atomic silicon produced. Evidence for the opening of an efficient dissociation channel leading to Si( 1D 2) + H 2( 1Σ g +) from high vibrational levels of the SiH 2( 1B 1) state is presented and discussed.

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