Universität zu Köln

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

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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
Creators:	Creators Email ORCID ORCID Put Code Stoffels, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kluge, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bruenken, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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
Uncontrolled Keywords:	Keywords Language 22-POLE ION-TRAP; EXTRAORDINARY SOURCES ANALYSIS; TRIPLY DEUTERATED AMMONIA; WIDE SPECTRAL SURVEY; HERSCHEL OBSERVATIONS; INTERSTELLAR-MEDIUM; LASER SPECTROSCOPY; NITROGEN HYDRIDES; GAS; FREQUENCY Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26357