Abstract
The semirigid bender Hamiltonian of Bunker and Landsberg ( J. Mol. Spectrosc. 67, 374-385, 1977) is used to study the ground state microwave, millimeter-wave, and far-infrared spectroscopic data for HNCS and its isotopomers. The results of the nonlinear least-squares fitting include a determination of the geometry of the molecule and of the in-plane HNC bending potential energy function. The fitted barrier to linearity is found to be approximately 990 cm −1, while consideration of the rotation structure of the v 4 = 1 state implies that the barrier lies near 900 cm −1. With an estimated uncertainty of about 200 cm −1 these values are in reasonable agreement.
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