INFRARED DOUBLE-RESONANCE SPECTROSCOPY OF $^{13}CD_{4}$
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Date
1984
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Journal ISSN
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Publisher
Ohio State University
Abstract
We have measured transitions in the $2\nu_{4} \leftarrow \nu_{4}$ band of $^{13}CD_{4}$ with an accuracy of better than $0.001 cm^{-1}$. The fine structure is fully resolved by the technique of infrared double resonance using a tunable diode $laser.^{1}$ Transitions have been observed which originate from the $J=11 F_{2}$ (2) level in $v_{4}=1$ (ref. 2) (pumped by the 10P (22) $CO_{2}$ laser line), and from many neighboring levels which are populated by collisional relaxation. A preliminary set of deduced spectroscopic constants will be presented. The decay of the induced absorptions yields a measurement of the rotational relaxation rate. Our results indicate that the cross-section for rotational relaxation in the excited vibrational state is approximately 50\% larger than in the ground $state.^{3}$
Description
$^{1}$ M. Dubs, D. Harradine, E. Schweitzer, and J.I. Steinfeld, J. Chem. Phys. 77, 3824 (1982). $^{2}$ Assignment kindly provided by R.S. McDowell and A.G. Robiette, private communication. $^{3}$ L. Laux, B. Foy, D. Harradine, and J.I. Steinfeld, J. Chem. Phys. (in press).
Author Institution: Department of Chemistry, Massachusetts Institute of Technology; Department of Chemistry, University of Texas at Austin
Author Institution: Department of Chemistry, Massachusetts Institute of Technology; Department of Chemistry, University of Texas at Austin