Universität zu Köln

Zakharenko, Olena, Lewen, Frank, Ilyushin, Vadim V., Mueller, Holger S. P., Schlemmer, Stephan ORCID: 0000-0002-1421-7281, Alekseev, Eugene A., Krapivin, Igor, Xu, Li-Hong, Lees, Ronald M., Garrod, Robin, Belloche, Arnaud and Menten, Karl M. (2019). Rotational spectroscopy of isotopic species of methyl mercaptan at millimeter and submillimeter wavelengths: (CH3SH)-S-34. Astron. Astrophys., 627. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Methyl mercaptan (CH3SH) is an important sulfur-bearing species in the interstellar medium, terrestrial environment, and potentially in planetary atmospheres. The aim of the present study is to provide accurate spectroscopic parameters for the most abundant minor isotopolog (CH3SH)-S-34 to support radio astronomical observations at millimeter and submillimeter wavelengths. The rotational spectrum of (CH3SH)-S-34, which is complicated by the large-amplitude internal rotation of the CH3 group versus the (SH)-S-34 frame, was investigated in the 49-510 GHz and 1.1-1.5 THz frequency ranges in natural isotopic abundance. The analysis of the spectrum was performed up to the second excited torsional state, and the obtained data were modeled with the RAM36 program. A fit within experimental accuracy was obtained with a RAM Hamiltonian model that uses 72 parameters. Predictions based on this fit are used to search for (CH3SH)-S-34 with the Atacama Large Millimeter/submillimeter Array (ALMA) toward the hot molecular core Sgr B2(N2), but blends with emission lines of other species prevent its firm identification in this source.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zakharenko, Olena UNSPECIFIED UNSPECIFIED UNSPECIFIED Lewen, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED Ilyushin, Vadim V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Holger S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, Stephan UNSPECIFIED orcid.org/0000-0002-1421-7281 UNSPECIFIED Alekseev, Eugene A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Krapivin, Igor UNSPECIFIED UNSPECIFIED UNSPECIFIED Xu, Li-Hong UNSPECIFIED UNSPECIFIED UNSPECIFIED Lees, Ronald M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garrod, Robin UNSPECIFIED UNSPECIFIED UNSPECIFIED Belloche, Arnaud UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, Karl M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-137380
DOI:	10.1051/0004-6361/201935579
Journal or Publication Title:	Astron. Astrophys.
Volume:	627
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; METHANOL; BARRIER Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13738