Universität zu Köln

Zakharenko, Olena, Ilyushin, Vadim V., Lewen, Frank, Muller, Holger S. P., Schlemmer, Stephan ORCID: 0000-0002-1421-7281, Alekseev, Eugene A., Pogrebnyak, Mykola L., Armieieva, Iuliia A., Dorovskaya, Olha, Xu, Li-Hong and Lees, Ronald M. (2019). Rotational spectroscopy of methyl mercaptan (CH3SH)-S-32 at millimeter and submillimeter wavelengths A73 (2019). Astron. Astrophys., 629. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

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 K-a 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zakharenko, Olena UNSPECIFIED UNSPECIFIED UNSPECIFIED Ilyushin, Vadim V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lewen, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED Muller, Holger S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, Stephan UNSPECIFIED orcid.org/0000-0002-1421-7281 UNSPECIFIED Alekseev, Eugene A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pogrebnyak, Mykola L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Armieieva, Iuliia A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dorovskaya, Olha UNSPECIFIED UNSPECIFIED UNSPECIFIED Xu, Li-Hong UNSPECIFIED UNSPECIFIED UNSPECIFIED Lees, Ronald M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-141667
DOI:	10.1051/0004-6361/201935759
Journal or Publication Title:	Astron. Astrophys.
Volume:	629
Date:	2019
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WAVE SPECTRUM; MICROWAVE-SPECTRUM; CHEMISTRY; METHANOL; BARRIER; CH3SH Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14166