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The gas-phase optical absorption spectrum of a thiophenoxy radical (C6H5S), adiffuse interstellar band (DIB) candidate molecule, was observed in thedischarge of thiophenol using a cavity ringdown spectrometer. The ground-staterotational constants of the thiophenoxy radical were theoretically calculated,and the excited-state rotational constants were determined from the observedrotational profile. The rotational profile of a near prolate molecule having aC2v symmetry was simulated on the basis of a rotational distribution model byradiation and collisions. Although the simulated profile did not agree with theobserved DIBs, the upper limit of the column density for the thiophenoxyradical in the diffuse clouds toward HD 204827 was evaluated. The profilesimulation indicates that rotational distribution by radiation and collisionsis important to reproduce a rotational profile for a DIB candidate and that thenear prolate C2v molecule is a possible candidate for DIB with a band widthvariation dependent on line-of-sight.

the astronomical journal

Laboratory Optical Spectroscopy of Thiophenoxy Radical and Its Profile  Simulation as a Diffuse Interstellar Band Based on Rotational Distribution by  Radiation and Collisions