Infrared spectrum and rovibrational analysis of the fundamental v 6 of H 3 Si 35 Cl and H 3 Si 37 Cl near 660 cm -1

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Abstract
The gas phase infrared spectra of monoisotopic H3Si35Cl and H3Si37Cl have been studied in the v 6 region with a resolution of 0·05 and 0·04 cm-1, respectively. For both species about 1200 lines have been assigned to v 6 and fitted by a least squares procedure, σ(J, K)=4 × 10-3 cm-1, sets of 9 molecular parameters being refined for each molecule. The hot bands (v 3 + v 6) - v 3 and 2v 6 ±2 - v +-1 as well as v 6 of H3 29Si35Cl and H3 29Si37Cl have been detected, and information concerning the υ3=υ6=1 state of H3 28Si35Cl and H3 28Si37Cl and the υ6=1 state of the 29Si isotopic species has been obtained. Within the limits of the precision of the measurement the υ6=1 state, v 0=664·1317(3)/663·7370(3) cm-1 (H3 28Si35/37Cl), is essentially unperturbed.