Deuterated methyl mercaptan (CH 3 SD): Laboratory rotational spectroscopy and search toward IRAS 16293–2422 B

Zakharenko, Olena; Lewen, Frank; Ilyushin, Vadim V.; Drozdovskaya, Maria N.; Jørgensen, Jes K.; Schlemmer, Stephan; Müller, Holger S. P. (2019). Deuterated methyl mercaptan (CH 3 SD): Laboratory rotational spectroscopy and search toward IRAS 16293–2422 B. Astronomy and astrophysics, 621(A114), A114. EDP Sciences 10.1051/0004-6361/201834472

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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 Köln 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 ∼18%.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Center for Space and Habitability (CSH)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Drozdovskaya, Maria Nikolayevna

Subjects:

500 Science > 520 Astronomy
500 Science
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Danielle Zemp

Date Deposited:

14 Apr 2020 14:46

Last Modified:

19 Apr 2020 02:53

Publisher DOI:

10.1051/0004-6361/201834472

BORIS DOI:

10.7892/boris.142656

URI:

https://boris.unibe.ch/id/eprint/142656

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