Transient detection in infrared multiphoton decomposition of (chloromethyl)silane and 1,3-disilacyclobutane: evidence for cleavage of SiCH 4 intermediates

Abstract

The transients produced in the infrared multiphoton decomposition (IRMPD) of (chloromethyl)silane—HClSi:, H 2Si: and H 2C:—and of 1,3-disilacyclobutane—H 2Si: and H 2C:—have been identified by laser-induced fluorescence (LIF). The nascent HClSi: and H 2Si: populations are generated with a high degree of excitation and the species produced from (chloromethyl)silane possess more rotational and vibrational energy than those produced from 1,3-disilacyclobutane. The obtained quenching rate and radiative lifetime for HClSi: are (4.6±0.3)×10 −10 cm 3 per molecule s −1 and 369±10 ns, respectively. The formation of H 2Si: and H 2C: in IRMPD of both (chloromethyl)silane and 1,3-disilacyclobutane adds to previous knowledge on decomposition of (chloromethyl)silane and 1,3-disilacyclobutane and suggests that these transients are produced from the same SiCH 4 (H 3Si(H)C: and (CH 3)HSi:) intermediates.