Laboratory rotational ground state transitions of NH${}_3$D${}^{+}$ and CF${}^{+}$

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 millimeter-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 NH${}_3$D${}^{+}$ ($J_K=1_0-0_0$), 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 NH${}_3$D${}^{+}$ 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 PDR.

arXiv comment7 pages, 2 figures

References in corpus (27)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The UMIST database for astrochemistry 2012
• Detection of a Noble Gas Molecular Ion, {36}ArH^+, in the Crab Nebula
• The chemistry of fluorine-bearing molecules in diffuse and dense interstellar gas clouds
• Ubiquitous argonium (ArH${}^{+}$) in the diffuse interstellar medium -- a molecular tracer of almost purely atomic gas
• Triply deuterated ammonia in NGC 1333
• Herschel observations of EXtra-Ordinary Sources: Analysis of the HIFI 1.2 THz Wide Spectral Survey Toward Orion KL I. Methods
• Nitrogen isotopic ratios in Barnard 1: a consistent study of the N2H+, NH3, CN, HCN and HNC isotopologues
• Discovery of Interstellar CF+
• The abundances of nitrogen-containing molecules during pre-protostellar collapse
• Nitrogen hydrides in interstellar gas: Herschel/HIFI observations towards G10.6-0.4 (W31C)
• Nitrogen hydrides in interstellar gas II. Analysis of Herschel/HIFI observations towards W49N and G10.6-0.4 (W31C)
• Nitrogen hydrides in the cold envelope of IRAS16293-2422
• Spin-state chemistry of deuterated ammonia
• Gas phase production of NHD2 in L134N
• Detection of the Ammonium Ion in Space
• Detection of extragalactic argonium, ArH${}^{+}$, toward PKS~1830$-$211
• First detection of ND in the solar-mass protostar IRAS16293-2422
• The IRAM-30m line survey of the Horsehead PDR: I. CF+ as a tracer of C+ and a measure of the Fluorine abundance
• HCO, c-C3H and CF+ : three new molecules in diffuse, translucent and "spiral-arm'' clouds
• Tentative Detection of the Nitrosylium Ion in Space
• Detection of extragalactic CF+ toward PKS1830-211 -- Chemical differentiation in the absorbing gas
• Probing the Earliest Stage of Protostellar Evolution -- Barnard 1-bN and Barnard 1-bS
• The hyperfine structure in the rotational spectrum of CF+
• Improved determination of the 1(0)-0(0) rotational frequency of NH3D+ from the high resolution spectrum of the v4 infrared band
• Widespread Galactic CF+ absorption: detection toward W49 with the Plateau de Bure Interferometer
• First detection of CF+ towards a high-mass protostar

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• Molecular ion abundances in the diffuse ISM : CF+, HCO+, HOC+, and C3H+
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