ChemInform Abstract: Rovibrational Studies of Isotopic Methyl Silanes

The A 1 and E species fundamentals of 12 CH 3 SiH 3 , 13 CH 3 SiH 3 , and 12 CH 3 SiD 3 samples have been analyzed by gas-phase infrared spectroscopy at resolutions of up to 0.05 cm −1 . Precise vibrational and rovibrational parameters have been obtained for most fundamentals over all three isotopic species. The K structure of the E species fundamentals which was sufficiently resolved was readily assigned in most cases, rendering subsequent analyses straightforward. Analyses of the methyl group deformation fundamentals, ν 9 , previously misassigned to the more intense ν 11 + ν 12 combination band, are presented. Definitive vibrational band origins for the silyl group deformation fundamentals, ν 10 , are presented, partly from observations of the overtone ν 0 10 . Analyses of five perpendicular combination and overtone bands are also given. Evidence of localized perturbations are observed in most of the 37 bands studied.