Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jpsj...49.1197k&link_type=abstract
Physical Society of Japan, Journal, vol. 49, Sept. 1980, p. 1197, 1198.
Astronomy and Astrophysics
Astronomy
2
Electron Transitions, Interstellar Matter, Methyl Compounds, Microwave Spectra, Thiols, Curve Fitting, Least Squares Method, Line Shape, Line Spectra, Molecular Spectra
Scientific paper
Results of the determination of the microwave frequencies and a-type molecular parameters of the a-type J = 1-0, 2-1 and 3-2 transitions in the ground state and some excited torsional states of the methyl mercaptan molecule, which are considered to be most suitable for the astronomical detection of this molecule, are reported. Observed laboratory frequencies are presented for the A and E lines of the R-branch transitions, and it is noted that the A lines with K not equal to zero exhibit K-type doublings analogous to the asymmetric rigid rotor. The observed frequencies were then used to provide least-squares fits to the average of two effective rotational constants, three torsion-rotation constants, two centrifugal distortion constants (determined for the first time), and the difference between the effective rotational constants.
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