Stoffels, A., Kluge, L., Schlemmer, S. and Bruenken, S. (2016). Laboratory rotational ground state transitions of NH3D+ and CF+. Astron. Astrophys., 593. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746
Full text not available from this repository.Abstract
Aims. This paper reports accurate laboratory frequencies of the rotational ground state transitions of two astronomically relevant molecular ions, NH3D+ and CF+. Methods. Spectra in the millimetre-wave band were recorded by the method of rotational state-selective attachment of He atoms to the molecular ions stored and cooled in a cryogenic ion trap held at 4 K. The lowest rotational transition in the A state (ortho state) of NH3D+ (J(K) = 1(0)-0(0)), and the two hyperfine components of the ground state transition of CF+ (J = 1-0) were measured with a relative precision better than 10(-7). Results. For both target ions, the experimental transition frequencies agree with recent observations of the same lines in different astronomical environments. In the case of NH3D+ the high-accuracy laboratory measurements lend support to its tentative identification in the interstellar medium. For CF+ the experimentally determined hyperfine splitting confirms previous quantum-chemical calculations and the intrinsic spectroscopic nature of a double-peaked line profile observed in the J = 1-0 transition towards the Horsehead photon-dominated region (PDR).
Item Type: | Journal Article | ||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-263571 | ||||||||||||||||||||
DOI: | 10.1051/0004-6361/201629101 | ||||||||||||||||||||
Journal or Publication Title: | Astron. Astrophys. | ||||||||||||||||||||
Volume: | 593 | ||||||||||||||||||||
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 | ||||||||||||||||||||
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Refereed: | Yes | ||||||||||||||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/26357 |
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