Knowledge Bank

High resolution rovibrational spectra of several bands associated with the $\nu 1$ (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 $\nu 2$ fundamental, the combination bands $\nu 1+2\nu 20$, $\nu 1+\nu 21$, $\nu 1+v3.v1+2v20+v3$, the hot band band $\nu 1+2\nu 202\nu 20$, and the difference band $\nu 1-2\nu 20$ were observed and analyzed. Nuclear quadrupole splittings have been partially resolved in Q branch transitions of the $\nu 1+v21$ band. A strong Coriolis perturbation between the $\nu 1+v21$ and $\nu 1+v3$ 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.