THE $v_{t}=3$ STATE OF METHANOL
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Date
2006
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Publisher
Ohio State University
Abstract
The rotational spectrum of methanol is characterized by an asymmetric top overall rotation coupled with an intermediate barrier three fold hindered rotation. The spectrum progresses from a torsionally modified asymmetric top in the $v_{t}=0$ state to a rotationally modified torsion by the $v_{t}=2$ state. The $v_{t}=3$ state lies well above the torsional barrier and in close proximity to the CO stretch vibration. The $v_{t}=3$ microwave spectrum has been assigned up to $J=34$ in over 1 THz of frequency measured spectra. In spite of the success in assigning the a-type R-branches the b-type spectra is surprisingly weak suggesting that the torsion significantly modifies the intensities of the few $K$ levels in close enough proximity to have transitions below 2.5 THz.
Description
Author Institution: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109; Planetary Sciences, California Institute of Technology, Mail Stop 150-21, Pasadena, CA 91125