Universität zu Köln

Zakharenko, Olena, Lewen, Frank, Ilyushin, Vadim V., Drozdovskaya, Maria N., Jorgensen, Jes K., Schlemmer, Stephan ORCID: 0000-0002-1421-7281 and Mueller, Holger S. P. (2019). Deuterated methyl mercaptan (CH3SD): Laboratory rotational spectroscopy and search toward IRAS 16293-2422 B. Astron. Astrophys., 621. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Methyl mercaptan (also known as methanethiol), CH3SH, has been found in the warm and dense parts of high-as well as low-mass star-forming regions. The aim of the present study is to obtain accurate spectroscopic parameters of the S-deuterated methyl mercaptan CH3SD to facilitate astronomical observations by radio telescope arrays at (sub) millimeter wavelengths. We have measured the rotational spectrum associated with the large-amplitude internal rotation of the methyl group of methyl mercaptan using an isotopically enriched sample in the 150-510 GHz frequency range using the Koln millimeter wave spectrometer. The analysis of the spectra has been performed up to the second excited torsional state. We present modeling results of these data with the RAM36 program. CH3SD was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS) of the deeply embedded protostar IRAS 16293-2422. The derived upper limit corresponds to a degree of deuteration of at most similar to 18%.

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 Drozdovskaya, Maria N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jorgensen, Jes K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, Stephan UNSPECIFIED orcid.org/0000-0002-1421-7281 UNSPECIFIED Mueller, Holger S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-159139
DOI:	10.1051/0004-6361/201834472
Journal or Publication Title:	Astron. Astrophys.
Volume:	621
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 SUBMILLIMETER-WAVE SPECTRUM; ALMA-PILS SURVEY; MICROWAVE-SPECTRUM; SULFUR CHEMISTRY; TORSIONAL STATES; MOLECULES; BARRIER; 1ST Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15913