MILLIMETER-WAVE SPECTROSCOPY FOR VAN DER WAALS BENDING HOT BANDS OF THE Ar-HCN COMPLEX
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Date
2000
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Journal ISSN
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Publisher
Ohio State University
Abstract
We report n millimeter-wave spectroscopic study for the vdW bending $j=2-1$ hot bands of the Ar-HCN complex. In the frequency region of 150 - 300 GHz, in total 154 rovibrational lines including hyperfine splittings for all $j=2-1$ subbands have been observed by using direct absorption spectroscopy combined with a pulsed nuzzle. The spectroscopic constants including the Coriolis interaction constants were determined precisely. The energies of the $|K|$ sublevels in the $j=2$ state decrease with increasing $|K|$. The order is reversed against that in the $j=1$ $state^{a}$. The change in distance between Ar and center of mass of HCN for the $\sigma$ and $\Pi$ states due to die excitation of the bending vibration from $j=1$ to 2 is not obvious as in the case of that from $j=0$ to 1. The $eQq_{aa}$ constants in the $\Sigma_{2} \Pi_{2}$ and $\Delta_{2}$ states are determined to be -0.4, -0.6 and 1.2 MHz [-1.3, -0.7 and 1.3 MHz in the free rotor limit respectively], suggesting the $\Pi_{2}$ and $\Delta_{2}$ states have more free rotor character.
Description
$^{a}$ S. Drucker, A. L. Cooksy and W. Klemperer, J. Chem. Phys., 98, 5158 (1993).
Author Institution: Department of Applied Molecular Science, Institute for Molecular Science
Author Institution: Department of Applied Molecular Science, Institute for Molecular Science