Universität zu Köln

Xu, Li-Hong, Lees, R. M., Zakharenko, O., Mueller, H. S. P., Lewen, F., Schlemmer, S. and Menten, K. M. (2021). Millimeter-wave spectroscopy of the (CH3OD)-C-13 isotopic species of methyl alcohol. J. Mol. Spectrosc., 378. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1096-083X

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Abstract

The dramatic increase in sensitivity, spectral coverage and resolution of radio astronomical facilities in recent years has opened new possibilities for observation of chemical differentiation and isotopic fractionation in protostellar sources to shed light on their spatial and temporal evolution. In warm interstellar environments, methanol is an abundant species, hence spectral data for its isotopic forms are of special interest. In the present work, the millimeter-wave spectrum of the (CH3OD)-C-13 isotopologue has been investigated over the region from 150 to 510 GHz to provide a set of transition frequencies for potential astronomical application. The focus is on two types of prominent (CH3OD)-C-13 spectral groupings, namely the a-type R-q-branch multiplets and the b-type Q-branches. Line positions are reported for the R-q (J) clusters for J = 3 to 10 for the v(t) = 0 and 1 torsional states, and for a number of v(t) = 0 and 1 (r)Q(J) or (p)Q(J) line series up to J = 25. The frequencies have been fitted to a multi-parameter torsion-rotation Hamiltonian, and upper level excitation energies have been calculated from the resulting molecular constants. (C) 2021 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Xu, Li-Hong UNSPECIFIED UNSPECIFIED UNSPECIFIED Lees, R. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zakharenko, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, H. S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lewen, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, K. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-579002
DOI:	10.1016/j.jms.2021.111473
Journal or Publication Title:	J. Mol. Spectrosc.
Volume:	378
Date:	2021
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:	SAN DIEGO
ISSN:	1096-083X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COMPLEX ORGANIC-MOLECULES; ENERGY-LEVELS; SPECTRUM; ALMA; PROTOSTARS; METHANOL Multiple languages Physics, Atomic, Molecular & Chemical; Spectroscopy Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57900