FIR LASER STARK SPECTROSCOPY OF $CH_{3}^{18}OH$.
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Date
1992
Journal Title
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Volume Title
Publisher
Ohio State University
Abstract
The laser stark spectrum of $CH_{3}^{18}OH$ was investigated using the HCN laser lines. The spectra were taken for both parallel and perpendicular polarizations at stark electric fields up to 60.000 V/cm. Several transitions involving high J and K values, have been studied at the 311 um and 337 um lines of the HCN laser. Some of the transitions observed at 311 um have been identified as $J_{k}= 10_{2} \leftarrow 9_{1}, A_{1}^{+}, v_{1} = 0$, $J_ k = 21_{0}\leftarrow 20_{0}$, $E. v_{1}= 0$, $J_{k}= 20_{6} \leftarrow 20_{5}, A, v_{1} = 1$, and $J_{k}= 15_{4} \leftarrow 16_{3}$, $E_{2}, v_{1}= 1$. A few transitions observed at 337 um have been assigned as $J_{k}= 9_{6}\leftarrow 10_{5}, E_{2}, v_{1} = 0$ and $J_{k} = 1 1 \leftarrow 2_{2}$, $E_{2}$, in the $v_{1} = 1$ torsional state. Using the stark shifts of the transition $J_{k} = 9_{6} \leftarrow 10_{5}$, $E_{2}, v_{1} = 0$ and the frequency of this transition, as obtained from the combination relations of observed absorption peaks in a recently recorded Fourier transform far infrafed spectrum, the parallel component of the electric dipole moment of $CH_{3}^{18}OH$ is obtained as 0.898 D. Zero field frequencies for all the assigned transitions are given with improved accuracy over those calculated from molecular constants.""
Description
Author Institution: Department of Physics, SUNY at Oswego; Department of Chemistry, SUNY at Oswego; Department of Physics, University of New Brunswick; Department of Physics, Center for Advanced Technology