Universität zu Köln

Mueller, Holger S. P., Drouin, Brian J., Pearson, John C., Ordu, Matthias H., Wehres, Nadine ORCID: 0000-0001-8881-2916 and Lewen, Frank (2016). Rotational spectra of isotopic species of methyl cyanide, CH3CN, in their v(8)=1 excited vibrational states. Astron. Astrophys., 586. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Methyl cyanide is an important trace molecule in space, especially in star-forming regions where it is one of the more common molecules used to derive kinetic temperatures. Aims. We want to obtain accurate spectroscopic parameters of minor isotopologs of methyl cyanide in their lowest excited v(8) = 1 vibrational states to support astronomical observations, in particular, with interferometers such as ALMA. Methods. The laboratory rotational spectrum of methyl cyanide in natural isotopic composition has been recorded from the millimeter to the terahertz regions. Results. Transitions with good signal-to-noise ratios could be identified for the three isotopic species (CH3CN)-C-13, (CH3CN)-C-13, and (CH3CN)-N-15 up to about 1.2 THz (J '' <= 66). Accurate spectroscopic parameters were obtained for all three species. Conclusions. The present data were already instrumental in identifying v(8) = 1 lines of methyl cyanide with one C-13 in IRAM 30 m and ALMA data toward Sagittarius B2(N).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mueller, Holger S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Drouin, Brian J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pearson, John C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ordu, Matthias H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wehres, Nadine UNSPECIFIED orcid.org/0000-0001-8881-2916 UNSPECIFIED Lewen, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-285354
DOI:	10.1051/0004-6361/201527602
Journal or Publication Title:	Astron. Astrophys.
Volume:	586
Date:	2016
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LASER STARK SPECTROSCOPY; SYMMETRIC TOP MOLECULES; LOW-LYING STATES; MICROWAVE-SPECTRA; COLOGNE DATABASE; LINE SURVEY; MILLIMETER; SUBMILLIMETER; PROTOSTAR; FORMATE Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28535