TORSIONAL SPECTRUM OF $^{12}$CH$_{3}$$^{13}$CH$_{3}$: A 2-STATE FREQUENCY ANALYSIS OF THE TORSIONAL BANDS AND THE $\nu_{12}$ VIBRATIONAL FUNDAMENTAL
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Date
2009
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Publisher
Ohio State University
Abstract
The far-infrared spectrum of $^{12}$CH$_{3}$$^{13}$CH$_{3}$ is studied between $220-350$ cm$^{-1}$ at an effective resolution of $0.004-0.005$ cm$^{-1}$ using a Bruker IFS-120 HR . Observation of the torsional fundamental $\nu_{6}$ ($289$ cm$^{-1}$) and the torsional hot band $2\nu_{6}-\nu_{6}$ ($255$ cm$^{-1}$), together with the lowest frequency vibrational fundamental $\nu_{12}$ ($821.5$ cm$^{-1}$), also obtained with the same spectrometer at an effective resolution of $0.0025$ cm$^{-1}$, gives information on the torsional stack of the ground vibrational state and that for $v_{12}=1$ state. The frequencies are analysed in terms of a 2-state fit to determine the torsion mediated Coriolis interactions between the torsional stacks. A comparison is made with a 2-state fit of similar data for $^{12}$CH$_{3}$$^{12}$CH$_{3}.$
Description
Author Institution: Department of Physics and Astronomy, University of Calgary; Calgary, AB T2N 1N4, CANADA; Department of Physical Sciences, University of Oulu, PO Box 3000, Fin-90014; Oulu, Finland