FB10		15min11:16

J. HAN, A. L. MCINTOSH, Z. WANG, R. R. LUCCHESE AND J. W. BEVAN, Department of Chemistry, Texas A and M University, College Station, TX 77843.

High resolution rovibrational spectra of several bands associated with the ₁ (HBr stretch) of both Ar-H⁷⁹Br and Ar-H⁸¹Br isotopomers have been recorded using a tunable infrared diode laser supersonic jet spectrometer. In addition to the ₁ fundamental, the combination bands ₁+2₂⁰, ₁+₂¹, ₁+₃, ₁+2₂⁰+₃, the hot band ₁+2₂⁰-2₂⁰, and the difference band ₁-2₂⁰ were observed and analyzed. Nuclear quadrupole splittings have been partially resolved in Q branch transitions of the ₁+₂¹ band. A strong Coriolis perturbation between the ₁+₂^1e and ₁+₃ was observed and analyzed. These results have been incorporated to determine an improved H4 intermolecular potential for Ar-HBr. In addition, the intermolecular potential surface for the Ar-HBr with HBr in its v=1 state has also been modeled based on the experimental results of this work.