High resolution FTIR spectroscopy of the ν1 band of NSCl†
Abstract
The highly reactive molecule thiazyl chloride (NSCl) prepared by pyrolysis of S3N2Cl2 at 70 °C was measured by high resolution (0.003 cm−1) FTIR spectroscopy in the mid-IR region. Detailed analyses of ν1, the hybrid a/b-type band at 1325.6 cm−1, led to assignment of 6275 and 3836 lines, respectively, for the 14N32S35Cl and 14N32S37Cl isotopomers. Fitting to Watson’s A-reduced Hamiltonian led to the first rovibrational constants for the ν1 mode along with an improved set of ground state constants including centrifugal distortion beyond the quartic level.