A FULL IAM ANALYSIS OF TORSION IN THE GROUND STATE MILLIMETER WAVE SPECTRUM OF METHYL FORMATE.
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Date
1993
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Ohio State University
Abstract
The rotational spectrum of methyl formate has been extensively measured and analysed by PAM methods up to high J $values^{(1,2)}$. We have re-analysed these results by an IAM technique not calling for large matrix $diagonalisation^{(3)}$ and carried out further measurements in the 140-160 GHz band. The Hamiltonian used utilises a planar rotation which transforms the quartic and sextic centrifugal distortion terms to an internal axes $system^{(4,5)}$. Our analysis gives comparable rms deviations with 10 fewer parameters, and leads to a 2.5\% smaller $\nu_{3}$ value of 391.592(168) $cm^{-1}$ with slight changes in the rotation and centrifugal constants.
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Author Institution: c/o N.Riazi, Department of Physics, University of Shiraz; Schuster Laboratory., University of Manchester
Author Institution: c/o N.Riazi, Department of Physics, University of Shiraz; Schuster Laboratory., University of Manchester