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MEASUREMENT OF THE $\nu_{2}$ PERPENDICULAR BENDING MODE OF Ar-HCl BY INTRACAVITY FAR INFRARED LASER STARK SPECTROSCOPY
D. Ray, Rebecca L Robinson, D.-H. Gwo, Richard J. Saykally
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Abstract
The low frequency $\\nu_{2}$ perpendicular bending fundamental band of the Ar-HCl van der Waals molecule has been measured in direct absorption near $34 cm^{-1}$ by the new technique of intracavity far infrared laser Stark spectroscopy. Ar-HCl was generated in a free jet expansion of a 2% HCl-in-Argon gas mixture within the cavity of the laser. We have observed 80 spectral lines on 2 different far infrared laser lines, with excellent signal to noise (10$^{4}$). The resolution is sufficient to observe the electric quadrupole hyperfine structure of the transitions. Preliminary analysis of the spectra yields values for the following molecular contants: $\\nu_{2} , B^{\\prime} , D^{\\prime}, q,\\mu^{\\prime}, eq_{0}Q.$ This work was supported by the Director, Office of Basic Research, U.S. Department of Energy.