C-type transitions in methyl formate

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Forbidden Transitions, Formates, Methyl Compounds, Molecular Clouds, Molecular Rotation, Line Spectra, Quantum Numbers

Scientific paper

In a previous laboratory analysis of the millimeter-wave spectrum of the asymmetric top methyl formate in its ground (υt = 0) torsional E (degenerate) substate, the authors predicted the transition frequencies and intensities of a large number of rotational transitions below 300 GHz. They have recently found that there are some additional moderately strong spectral lines - called c-type transitions - which would be forbidden in methyl formate, since it does not possess a dipole moment along the c-principal axis, except for the perturbative influence of internal rotation (torsional motion). The authors have calculated the frequencies and intensities of these c-type transitions, as well as other "forbidden" transitions labeled as x-type. The stronger c-type transitions below 300 GHz have been included in a list of spectral frequencies presented in this paper.

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