Abstract
The pure rotational absorption spectrum of the SH radical in the ground 2Π state was observed by a high-resolution Fourier transform spectrometer. The radical was generated by a dc discharge in an H2S, H2, and He mixture. Rotational transitions in the 2 Π1/2 components were directly observed for the first time. The observed 31 absorption lines, together with Λ-type doubling transitions measured by Meerts and Dymanus (Astrophs. J.187, L45, 1974; Can. J. Phys.53, 2123, 1975), were analyzed by a least-squares method, to determine the rotational, centrifugal, spin-rotation coupling, and Λ-type doubling constants in the ground state.
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