Universität zu Köln

Koerber, M., Bisschop, S. E., Endres, C. P., Kleshcheva, M., Pohl, R. W. H., Klein, A., Lewen, F. and Schlemmer, S. (2013). Laboratory rotational spectra of the dimethyl ether C-13-isotopologues up to 1.5 THz. Astron. Astrophys., 558. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Dimethyl ether is found in high abundance in the interstellar medium. Owing to its strong and dense spectrum throughout the entire microwave and terahertz regime, it contributes to the spectral confusion in astronomical line surveys. The great sensitivity of new observatories like ALMA enhances the need for reliable spectroscopic data, especially for isotopic species of abundant molecules. In addition, the study of the interstellar C-12/C-13 isotopic ratio can be used as a tracer of the formation process of a molecular species, and thus it gives insight into the chemical evolution of the observed region. Aims. The interpretation of astronomical observations depends on the knowledge of accurate rest frequencies and intensities. The objective of this work is to provide spectroscopic data for the two C-13-isotopologues of dimethyl ether in the vibrational ground state. Methods. High-resolution rotational-torsional spectra of (CH3OCH3)-C-12-C-13 and ((CH3)-C-13)(2)O have been measured in the laboratory covering frequencies up to 1.5 THz. The analysis is based on an effective rotational Hamiltonian for molecules with two large-amplitude motions. Results. Predictions of the complete ground state rotational spectrum of dimethyl ether-C-13(1) and -C-13(2) up to 2 THz are presented with accuracies better than 1 MHz. Based on the laboratory work, transitions of (CH3OCH3)-C-12-C-13 dimethyl ether have been detected for the first time in a large submillimeter line survey of the high-mass star forming region G327.3-0.6 performed with the APEX telescope.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Koerber, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bisschop, S. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Endres, C. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kleshcheva, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pohl, R. W. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klein, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lewen, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-474474
DOI:	10.1051/0004-6361/201321898
Journal or Publication Title:	Astron. Astrophys.
Volume:	558
Date:	2013
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 LOW-MASS PROTOSTARS; LINE SURVEY; MICROWAVE-SPECTRA; ORION-KL; MOLECULAR-SPECTROSCOPY; OBSERVATIONAL TESTS; ORGANIC-MOLECULES; COLOGNE DATABASE; EXCITED-STATES; SAGITTARIUS B2 Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47447