Tunneling motion in ArH+3 and isotopomers from the analysis of their rotational spectra

Bogey, M.; Bolvin, Hélène; Demuynck, C.; Destombes, J. L.; Eijck, B.P. van

doi:10.1063/1.453819

Cited by 63 publications

(48 citation statements)

References 11 publications

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“…[2]], and a precise determination of the tunneling splitting: 72(5) kHz; quoted uncertainties are 1r standard deviation in the mean. The value derived here is roughly that expected from the less precise, higher-J millimeter-wave data [24,25], in which splittings of 700(100) and 800(100) kHz, respectively, were measured for the 11 0;11 ! 10 0;10 and 12 0;12 !…”

Section: Ar á á á D þ 3 and Ar á á á D 2 H +mentioning

confidence: 97%

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High-resolution rotational spectroscopy of NNOH+, DCS+, , Ar⋯DCO+, and

McCarthy

Thaddeus

2010

Journal of Molecular Spectroscopy

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Section: Ar á á á D þ 3 and Ar á á á D 2 H +mentioning

confidence: 97%

“…Because this ion complex is calculated to possess a very large dipole moment, of order 9 D [24,25], care was required to avoid oversaturating its 1 0;1 ! 0 0;0 transition at 32.6 GHz -the only one which is accessible with our FTM spectrometer.…”

Section: Ar á á á D þ 3 and Ar á á á D 2 H +mentioning

confidence: 99%

High-resolution rotational spectroscopy of NNOH+, DCS+, , Ar⋯DCO+, and

McCarthy

Thaddeus

2010

Journal of Molecular Spectroscopy

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“…Unlike for the He-H + 3 complex rather detailed information on Ar-H + 3 is available for which pure rotational spectra have been recorded before [65][66][67]. These experiments stimulated ab initio calculations with large basis sets [68].…”

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confidence: 98%

“…Overall, the binding of the rare gas atom is substantially stronger (26 times stronger according to [62]) and so are the tunnelling barriers. The large amplitude tunnelling motion for the in-plane rotation of H + 3 with respect to Ar has been considered explicitly [67] for the interpretation of the high-resolution spectra [66]. As it turns out, the rotational tunnelling splittings are below 1 MHz for the Ar-H + 3 complex and significantly larger for the Ar-D + 3 complex.…”

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confidence: 98%

Controlled synthesis and analysis of He–H⁺₃in a 3.7 K ion trap

et al. 2015

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Complexes of the triatomic hydrogen ion with helium were synthesised in a low-temperature 22-pole rf ion trap at He number densities of up to 10 16 cm −3 . Absolute ternary rate coefficients for sequentially attaching He atoms have been determined from the growth of complexes with increasing storage time. The number of helium-tagged ions is significantly reduced when increasing the nominal temperature from 4 to 25 K. Competition between attachment and dissociation via collisions leads to stationary He n -H + 3 (n up to 9) distributions. State-specific excitation of the trapped H + 3 ions via IR transitions significantly reduces the formation of complexes. Tuning the laser to v 2 = 1 transitions in the range of 2726 cm −1 leads to LIICG lines, i.e., to spectra caused by laser-induced inhibition of complex growth. In addition, almost 100 lines have been found between 2700 and 2765 cm −1 , which are attributed to laser-induced dissociation of the in situ formed He-H + 3 complex ions. These lines are not yet assigned; however, their absorption strength, statistics and predissociation lifetimes provide interesting information on both the stable complexes as well as on scattering resonances in low-energy H + 3 + He collisions. New calculations of the potential energy surface will help to analyse the dissociation spectrum. There are some indications that para-H + 3 is enriched under the conditions of the present experiment. IntroductionStudies of reactions between ions and neutrals under conditions relevant for astrochemistry are important for understanding different processes in the interstellar medium (ISM). Reactions involving helium and hydrogen significantly influence the overall evolution of our universe including the early universe chemistry and especially the 'Dark Age'. For modelling such environments, one needs reliable rate coefficients. A detailed discussion of primordial chemistry can be found in [1] and references therein. According to [2], helium became neutral at a red shift of z ∼ 2500. At those times, the density was already very low and the only way to form molecules was via radiative association. Because hydrogen was still ionised, models predict that the first molecule formed in space was HeH + . The coexistence of He and He + also lead to the formation of some He + 2 . Molecules were needed as coolants during the formation of the first galaxies. Also after these early times, helium and hydrogen play an important role. In all models of interstellar ion chemistry, the first steps are ionisation of He and H 2 by cosmic rays.

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“…] can not be ruled out. To determine the molecular structure clearly, measurements of mixed isotopomers such as Ar-H 2 D + and Ar-D 2 H + are required in the frequency range of 350-410 GHz (Bogey et al 1988). There are two possible equilibrium forms for the mixed isotopomers: one named sy where two H/D atoms are located symmetrically to the complex Ar-D/H axis, and the other named asy where two H/D atoms are located asymmetrically to the complex Ar-H/D axis.…”

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confidence: 99%

THz and Submillimeter‐wave Spectroscopy of Molecular Complexes

Tanaka

Harada

Yamada

2011

Handbook of High‐resolution Spectroscopy

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This article reviews the recent progress of terahertz (THz) and submillimter‐wave (SMMW) spectroscopy in the frequency range of 10–300 cm −1 and its application to the study of weakly bound molecular complexes. The first section describes the light sources used for generating THz radiation, which includes the backward‐wave oscillators (BWO), the multipliers with the GaAs monolithic membrane diode (MOMED), and the supperlattice electronic devices (SLED), as well as the tunable far infrared (TuFIR) lasers. In the following section, we introduce extremely sensitive spectrometers developed for observing very weakly bound molecular complexes, such as the intra‐cavity OROTRON spectrometer and the millimeterwave‐Fourier transform microwave (MMW‐FTMW) double resonance spectrometer. We also review the traditional millimeter‐wave spectrometers, electric‐resonance optothermal spectrometers (EROS), and the tunable far‐infrared (TuFIR) laser spectrometers, which have also been applied successfully to study weakly bound molecular complexes. In the last section, the recent topics of the THz and millimeterwave spectroscopy of molecular complexes are reviewed in the four subsections; (i) Rare gas‐molecule complexes: Rg‐HX, Rg‐CO, and Rg‐HCN, (ii) dimers: (CO) 2 , CO‐N 2 , HCN‐H 2 , and (H 2 O) 2 , (iii) water complexes (H 2 O) n , with n up to 6, and (iv) ion and radical complexes: ArSH, ArH 2 O, H 2 OHO 2 , and ArH 3 + .

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Tunneling motion in ArH+3 and isotopomers from the analysis of their rotational spectra

Cited by 63 publications

References 11 publications

High-resolution rotational spectroscopy of NNOH+, DCS+, , Ar⋯DCO+, and

High-resolution rotational spectroscopy of NNOH+, DCS+, , Ar⋯DCO+, and

Controlled synthesis and analysis of He–H⁺₃in a 3.7 K ion trap

THz and Submillimeter‐wave Spectroscopy of Molecular Complexes

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Tunneling motion in ArH+3 and isotopomers from the analysis of their rotational spectra

Cited by 63 publications

References 11 publications

High-resolution rotational spectroscopy of NNOH+, DCS+, , Ar⋯DCO+, and

High-resolution rotational spectroscopy of NNOH+, DCS+, , Ar⋯DCO+, and

Controlled synthesis and analysis of He–H+3in a 3.7 K ion trap

THz and Submillimeter‐wave Spectroscopy of Molecular Complexes

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Product

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Controlled synthesis and analysis of He–H⁺₃in a 3.7 K ion trap