IDENTIFICATION AND ANALYSIS OF THE FAR-INFRARED LASER MAGNETIC-RESONANCE SPECTRUM OF THE HS2 RADICAL

The first observation of the far-infrared laser magnetic resonance spectrum of the HS2 radical in its ground (2)A'' state is reported. The radical was produced in the gas-phase reaction between fluorine atoms and hydrogen sulfide, H2S. Spectra associated with several different rotational transitions (with values of N up to 30 and K-a up to 4) have been identified and analyzed to give an improved set of molecular parameters. In particular, the value for the centrifugal distortion constant Delta(K) of 24.339(10) MHz is significantly different from the value assumed by S. Yamamoto and S. Saito (Can. J. Phys. 72, 954 (1994)) in their earlier millimeter-wave study, Zeeman parameters have also been determined. (C) 1995 Academic Press, Inc.