Universität zu Köln

Ilyushin, Vadim V., Zakharenko, Olena, Lewen, Frank, Schlemmer, Stephan ORCID: 0000-0002-1421-7281, Alekseev, Eugene A., Pogrebnyak, Mykola, Lees, Ronald M., Xu, Li-Hong, Belloche, Arnaud, Menten, Karl M., Garrod, Robin T. and Mueller, Holger S. P. (2020). Rotational spectrum of isotopic methyl mercaptan, (CH3SH)-C-13, in the laboratory and towards Sagittarius B2(N2). Can. J. Phys., 98 (6). S. 530 - 538. OTTAWA: CANADIAN SCIENCE PUBLISHING. ISSN 1208-6045

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Abstract

Methyl mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate spectroscopic parameters for the (CH3SH)-C-13 isotopologue to facilitate its identification in the interstellar medium at millimetre and submillimetre wavelengths. Through careful analysis of recent CH3SH spectra from 49-510 GHz and 1.1-1.5 THz recorded at natural isotopic composition, extensive assignments were possible not only for the ground torsional state of (CH3SH)-C-13, but also in the first and second excited states. The torsion-rotation spectrum displays complex structure due to the large-amplitude internal rotation of the (CH3)-C-13 group, similar to the main and other minor isotopic species of methyl mercaptan. The assigned transition frequencies have been fitted to within experimental error with a 52-parameter model employing the RAM36 programme. With predictions based on this fit, (CH3SH)-C-13 was searched for in spectra from the Atacama Large Millimetre/sub-millimetre Array (ALMA) towards the Galactic centre source Sgr B2(N2). Several transitions were expected to be observable, but all of them turned out to be severely blended with emission from other species, which prevents us from identifying (CH3SH)-C-13 in this source.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ilyushin, Vadim V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zakharenko, Olena UNSPECIFIED UNSPECIFIED UNSPECIFIED Lewen, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, Stephan UNSPECIFIED orcid.org/0000-0002-1421-7281 UNSPECIFIED Alekseev, Eugene A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pogrebnyak, Mykola UNSPECIFIED UNSPECIFIED UNSPECIFIED Lees, Ronald M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Xu, Li-Hong UNSPECIFIED UNSPECIFIED UNSPECIFIED Belloche, Arnaud UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, Karl M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garrod, Robin T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Holger S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-331999
DOI:	10.1139/cjp-2019-0421
Journal or Publication Title:	Can. J. Phys.
Volume:	98
Number:	6
Page Range:	S. 530 - 538
Date:	2020
Publisher:	CANADIAN SCIENCE PUBLISHING
Place of Publication:	OTTAWA
ISSN:	1208-6045
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 MILLIMETER-WAVE SPECTRUM; SUBMILLIMETER SPECTRUM; SPECTROSCOPY; CHEMISTRY; BARRIER; STATES Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33199