MATTHEW P. BUCCHINO, Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721; JUSTIN P. YOUNG, PHIL M. SHERIDAN AND DAVID EWING, Department of Chemistry, Canisius College, Buffalo, New York 14208; LUCY M. ZIURYS, Department of Chemistry and Biochemistry, Department of Astronomy, and Steward Observatory, University of Arizona, Tucson, Arizona 85721.
The pure rotational spectrum of KSH (X1A') has been measured using millimeter-wave direct-absorption techniques for the first time. KSH was synthesized by the reaction of potassium vapor and H2S in the presence of a direct current discharge. Five rotational transitions in the frequency range of 260-300 GHz were recorded for both KSH and KSD in their ground electronic states. The K-ladder structure indicates Cs symmetry, and therefore a bent molecule. Accurate rotational and hyperfine constants have been determined from a global fit including previously measured microwave spectra. A comparison of KSH to other alkali metal hydrosulfides will be presented.