Abstract
The pure rotational spectrum of HNCS was recorded under high resolution by a Michelson-type Fourier transform infrared spectrometer in the far-infrared region; also, some high-J submillimeter-wave transitions (e.g., J = 91 ← 90) near 1 THz were observed with the precision of microwave spectroscopy using a high-frequency backward wave oscillator. Effective molecular parameters have been determined for each Ka substate of HNCS up to Ka = 7, for DNCS up to Ka = 6, for HNC34S up to Ka = 5, and for some Ka substates of HN13CS and H15NCS, by fitting the available microwave and millimeter-wave transitions simultaneously. The centrifugal distortion resonance has been clearly observed in HNCS and analyzed by a second-order perturbation treatment.
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