Universität zu Köln

Liu, Delong, Walters, Adam, Wehres, Nadine, Lewen, Frank, Schlemmer, Stephan ORCID: 0000-0002-1421-7281 and Mueller, Holger S. P. (2019). Rotational rest frequencies of the low lying vibrational states of n-propyl cyanide from extensive laboratory measurements up to 506 GHz. Astron. Astrophys., 622. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. The spectra of four low-lying vibrational states of both anti and gauche conformers of normal-propyl cyanide were previously measured and analyzed in two spectral windows between 36 and 127 GHz. All states were then identified in a spectral line survey called Exploring Molecular Complexity with ALMA (EMoCA) toward Sagittarius B2(N) between 84.1 and 114.4 GHz with the Atacama Large Millimeter /submillimeter Array (ALMA) in its Cycles 0 and 1. Aims. We wanted to extend the measurements and analysis up to 506 GHz to provide accurate predictions over a much wider range of frequencies, quantum numbers and energies. Methods. We carried out measurements in two additional frequency windows up to 506 GHz. Results. For the gauche conformer, a large number of both a-and b-type transitions were identified. For the anti conformer, transitions were predominantly, but not exclusively, a-type. We hence improved molecular parameters for the ground states of both antiand gauche-n-propyl cyanide and for excited vibrational states of the gauche conformer (v(30) = 1, v(29) = 1, v(30) = 2, v(28) = 1) and anti conformer (v(30) = 1, v(18) = 1, v(30) = 2, v(29) = 1) with high order coupling parameters determined between v(18) = 1 and v(30) = 2. Parameters are published for the first time for v(18) = v(30) = 1 of the anti conformer and for v(29) = v(30) = 1 of the gauche conformer. Conclusions. In total 15385 lines have been incorporated in the fits and should allow good predictions for unperturbed lines over the whole operating range of radio-telescopes. Evidence is found for vibrational coupling for some levels above 380 GHz. The coupling between v(18) = 1 and v(30) = 2 of the anti conformer has been well characterized. An additional list of 740 lines showing potential but as yet unidentified coupling has been provided for astrophysical identification.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Liu, Delong UNSPECIFIED UNSPECIFIED UNSPECIFIED Walters, Adam UNSPECIFIED UNSPECIFIED UNSPECIFIED Wehres, Nadine UNSPECIFIED UNSPECIFIED UNSPECIFIED Lewen, Frank 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:38-158701
DOI:	10.1051/0004-6361/201834227
Journal or Publication Title:	Astron. Astrophys.
Volume:	622
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 EXCITED METHYL FORMATE; MICROWAVE-SPECTRUM; DIPOLE-MOMENT; STRONG MASER; BUTYRONITRILE; EMISSION; LINE; HCN; SPECTROSCOPY; TRANSITIONS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15870