Difference-frequency laser spectroscopy of the ν4 fundamental band of NH3D+

Nakanaga, Taisuke; Amano, Tatsuya

doi:10.1139/p86-240

Cited by 24 publications

(25 citation statements)

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“…Among the strongest unidentified features we found one at 262816.7 MHz for v LSR =9 km s −1 , (see Figure 1) that was very close to the predicted frequency for the J K =1 0 -0 0 line of NH 3 D + . This deuterated species of the Ammonium ion was observed in the laboratory by Nakanaga & Amano (1986) through its ν 4 vibrational mode from which rotational constants for the ground state were derived. The molecule was incorporated some time ago to the MADEX code (Cernicharo 2012).…”

Section: Observationsmentioning

confidence: 99%

Detection of the Ammonium Ion in Space

Cernicharo

Tercero

Fuente

et al. 2013

ApJ

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We report on the detection of a narrow feature at 262816.73 MHz towards Orion and the cold prestellar core B1-bS, that we attribute to the 1 0 -0 0 line of the deuterated Ammonium ion, NH 3 D + . The observations were performed with the IRAM 30m radio telescope. The carrier has to be a light molecular species as it is the only feature detected over 3.6 GHz of bandwidth. The hyperfine structure is not resolved indicating a very low value for the electric quadrupolar coupling constant of Nitrogen which is expected for NH 3 D + as the electric field over the N nucleus is practically zero. Moreover, the feature is right at the predicted frequency for the 1 0 -0 0 transition of the Ammonium ion, 262817±6 MHz (3σ), using rotational constants derived from new infrared data obtained in our laboratory in Madrid. The estimated column density is (1.1±0.2)×10 12 cm −2 . Assuming a deuterium enhancement similar to that of NH 2 D, we derive N(NH + 4 )≃ 2.6×10 13 cm −2 , i.e., an abundance for Ammonium of a few 10 −11 .

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Section: Observationsmentioning

confidence: 99%

Detection of the Ammonium Ion in Space

Cernicharo

Tercero

Fuente

et al. 2013

ApJ

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“…An unknown feature close to the predicted frequency for the J K = 1 0 -0 0 line of NH 3 D + has been first detected in a miraculously void spectral region towards Orion KL. This deuterated ammonium was indeed observed in the infrared in the laboratory by Nakanaga and Amano [38] through its ν 4 vibrational mode from which rotational constants were derived. Higher resolution vibrational spectra allowed to significantly reduce the frequency uncertainties [39] through the same ν 4 vibrational mode and encompassing the detected frequency.…”

Section: Nh 3 Dmentioning

confidence: 63%

(New) molecular ions in the interstellar medium

Roueff

2015

EPJ Web of Conferences

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“…The ground state lines from this work (Table 1) were fitted together with ro-vibrational data from Doménech et al (2013). (a) Parameter was kept fixed in the fit to the value from Nakanaga & Amano (1986). Notes.…”

Section: Discussionmentioning

confidence: 99%

Laboratory rotational ground state transitions of NH₃D⁺and CF⁺

Stoffels

Kluge

Schlemmer

et al. 2016

A&A

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Aims. This paper reports accurate laboratory frequencies of the rotational ground state transitions of two astronomically relevant molecular ions, NH 3 D + 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 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 photon-dominated region (PDR).

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Difference-frequency laser spectroscopy of the ν₄ fundamental band of NH₃D⁺

Cited by 24 publications

References 0 publications

Detection of the Ammonium Ion in Space

Detection of the Ammonium Ion in Space

(New) molecular ions in the interstellar medium

Laboratory rotational ground state transitions of NH₃D⁺and CF⁺

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Difference-frequency laser spectroscopy of the ν4 fundamental band of NH3D+

Cited by 24 publications

References 0 publications

Detection of the Ammonium Ion in Space

Detection of the Ammonium Ion in Space

(New) molecular ions in the interstellar medium

Laboratory rotational ground state transitions of NH3D+and CF+

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Difference-frequency laser spectroscopy of the ν₄ fundamental band of NH₃D⁺

Laboratory rotational ground state transitions of NH₃D⁺and CF⁺