THE SPECTRAL STUDY OF THE OH ($\nu_{1}$) + CH ($\nu_{3}$) STRETCH COMBINATION BAND OF JET-COOLED METHANOL
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Date
2003
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Ohio State University
Abstract
The rotationally resolved overtone spectrum of the OH ($\ni_{1}$) + CH ($\nu_{3}$) stretch combination band of methanol between 6510 and $6550 cm^{-1}$ has been recorded at sub-Doppler resolution by continuous-wave cavity ringdwon spectroscopy (CW-CRDS). Of 572 recorded lines, 358 lines have been assigned by ground state combination differences, including the 21 subbands with $J^{\prime} = 0-8$ and $K^{\prime} = 0-3$. The perturbations of $E\ K^{\prime} = -1, -2$, and -3 levels have been observed and deperturbations have been carried out. The torsion-rotational constants in the upper state, obtained by fitting the observed spectrum to the Herbst Hamiltonian, are in a reasonable agreement with the predicted values based on the constants of the fundamental bands, $\nu_{1}$ and $\nu_{3}$. This combination band has fewer perturbations than the fundamental $\nu_{1}$, and the coupling matrix elements are smaller, 0.02 to $0.66 cm^{-1}$ as compared to 0.35 to $1.6 cm^{-1}$.
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Author Institution: Department of Chemistry, University of Akron