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.