Volume 629, September 2019
|Number of page(s)||10|
|Section||Atomic, molecular, and nuclear data|
|Published online||06 September 2019|
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
e-mail: email@example.com, firstname.lastname@example.org
2 Institute of Radio Astronomy of NASU, Mystetstv 4, 61002 Kharkiv, Ukraine
3 Quantum Radiophysics Department, V. N. Karazin Kharkiv National University, Svobody Square 4, 61022 Kharkiv, Ukraine
4 Department of Physics, University of New Brunswick, Saint John, NB, Canada
Accepted: 25 July 2019
We present a new global study of the millimeter (mm) wave, submillimeter (sub-mm) wave, and terahertz (THz) spectra of the lowest three torsional states of methyl mercaptan (CH3SH). New measurements have been carried out between 50 and 510 GHz using the Kharkiv mm wave and the Cologne sub-mm wave spectrometers whereas THz spectra records were used from our previous study. The new data, involving torsion–rotation transitions with J up to 61 and Ka up to 18, were combined with previously published measurements and fit using the rho-axis-method torsion–rotation Hamiltonian. The final fit used 124 parameters to give an overall weighted root-mean-square deviation of 0.72 for the dataset consisting of 6965 microwave (MW) and 16 345 far-infrared line frequencies sampling transitions within and between the ground, first, and second excited torsional states. This investigation presents a two-fold expansion in the J quantum numbers and a significant improvement in the fit quality, especially for the MW part of the data, thus allowing us to provide more reliable predictions to support astronomical observations.
Key words: methods: laboratory: molecular / techniques: spectroscopic / ISM: molecules / astrochemistry / molecular data / astronomical databases: miscellaneous
The line files of the MW data and of the FTFIR data along with a prediction file up to 2 THz are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/629/A73
© ESO 2019
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