15min:
THE MILLIMETER/SUBMILLIMETER SPECTRUM OF AlSH (X1A'): FUTHER INVESTIGATION OF METAL HYDROSULFIDE STRUCTURES.

A. J. JANCZYK AND L. M. ZIURYS, Department of Chemistry, Department of Astronomy, and Steward Observatory, University of Arizona, Tucson, AZ, 85721.

The pure rotational spectrum of AlSH has been recorded using millimeter/submillimeter wave direct absorption techniques. The molecule was produced by reacting aluminum vapor with H2S in the presence of a d.c. discharge. Transitions ranging from J = 23 rightarrow 24 to J = 30 rightarrow 31 in the region 319 - 418 GHz were measured. The spectra exhibited Ka ladder structure for Ka = 0 to Ka = 6 for the species, which is consistent with the molecule being an asymmetric top. The higher asymmetry components (Ka = 5,6) are, however, perturbed. Rotational constants as well as an ro structure have been determined. The study shows that the AlSH molecule is bent and therefore different from linear AlOH.