Dissociative recombination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">HeH</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>: A reexamination

Yousif, F. B.; Mitchell, James B.; Rogelstad, Michael; Paddelec, A. Le; Canosa, André; Chibisov, M. I.

doi:10.1103/physreva.49.4610

Cited by 40 publications

(22 citation statements)

References 20 publications

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“…Furthermore, the relative simplicity of the system helps to gauge new experimental setups while also serving as a benchmark for different theoretical models. For these reasons, the low-energy collision process between electrons and the HeH + cations has attracted experimental interest [2][3][4][5][6][7][8][9] and theoretical studies [3,[10][11][12][13][14][15] over the past three decades.…”

Section: Introductionmentioning

confidence: 99%

Inelastic low-energy collisions of electrons with HeH+: Rovibrational excitation and dissociative recombination

Čurík

Greene

2017

The Journal of Chemical Physics

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Inelastic low-energy (0-1 eV) collisions of electrons with HeH + cations are treated theoretically, with a focus on the rovibrational excitation and dissociative recombination (DR) channels. In an application of ab initio multichannel quantum defect theory (MQDT), the description of both processes is based on the Born-Oppenheimer quantum defects. The quantum defects were determined using the R-matrix approach in two different frames of reference:the center-of-charge and the center-of-mass frames. The results obtained in the two reference systems, after implementing the Fano-Jungen style rovibrational frame-transformation technique, shows differences in the rate of convergence for these two different frames of reference.We find good agreement with the available theoretically predicted rotationally inelastic thermal rate coefficients. Our computed DR rate also agrees well with available experimental results. Moreover, several computational experiments shed light on the role of rotational and vibrational excitations in the indirect DR mechanism that governs the low energy HeH + dissociation process. While the rotational excitation is several orders of magnitude more probable process at the studied collision energies, the closed-channel resonances described by the high-n, rotationally excited neutral molecules of HeH contribute very little to the dissociation probability. But the situation is very different for resonances defined by the high-n, vibrationally excited HeH molecules, which are found to dissociate with approximately 90%

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Section: Introductionmentioning

confidence: 99%

Inelastic low-energy collisions of electrons with HeH+: Rovibrational excitation and dissociative recombination

Čurík

Greene

2017

The Journal of Chemical Physics

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“…If the gas phase chemistry of such media is to be understood, information is needed on both the recombination rate coefficients and product yields. Total recombination coefficients ␣, and their variation with temperature, have been determined for a number of ions 7 using techniques such as stationary afterglows, [8][9][10][11] merged beams, [12][13][14] flowing afterglows, [15][16][17] and recently ion storage rings. 18,19 However, obtaining quantitative information on neutral products 20,21 of DR is experimentally far more difficult, and although considerable progress has been made in the last few years there still is a paucity of reliable data.…”

Section: Introductionmentioning

confidence: 99%

Yield determination of OH(v=0,1) radicals produced by the electron-ion recombination of H3O+ ions

Gougousi

Johnsen

Golde

1997

The Journal of Chemical Physics

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Articles you may be interested inDissociative recombination of H + ( H 2 O ) 3 and D + ( D 2 O ) 3 water cluster ions with electrons: Cross sections and branching ratios Nascent rovibrational distributions of CO (d 3 Δ i ,e 3 Σ − ,a ′ 3 Σ + ) produced in the dissociative recombination of CO 2 + with electrons J. Chem. Phys. 108, 8031 (1998); 10.1063/1.476243Yield determination of OH (v=0,1) radicals produced by the electron-ion recombination of protonated molecules A flowing afterglow apparatus in conjunction with laser induced fluorescence ͑LIF͒ diagnostics has been used to determine the yield of OH͑vϭ0,1͒ produced by the dissociative recombination ͑DR͒ of H 3 O ϩ ions with electrons at 300 K. The yield for vϭ0 radicals ͑0.48 Ϯ 0.07͒ was determined by two different methods: ͑1͒ by comparing it to the known OH yield of the ion-molecule reaction Ar ϩ ϩH 2 O and ͑2͒ by comparing it to that of the reaction of metastable Ar atoms ͑Ar*͒ with H 2 O. The yield of vibrationally excited OH͑vϭ1͒ ͑0.12Ϯ 0.02͒ was obtained relative to that in vϭ0 by comparing LIF spectra. The results corroborate earlier experimental work which determined the yields of OH in vϭ0 and in unspecified vibrationally excited states vϾ0.

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“…They also found resonance structures in the low-energy region; however, these were not in very good agreement with each other or with the experimental results measured for 3 HeH + (65) and 4 HeH + (69) in CRYRING (see Figure 5). New storage ring experiments, discussed in the next section, indicate that the interpretation of Yousif et al's (70) results is probably incorrect. The framework for DR of HeH + that has emerged from the combined experimental and theoretical efforts has been challenged by a reinterpretation of the single-pass merged-beams results (70), which claims that low-energy DR occurs because of the presence in the ion beam of HeH + populating its lowest triplet state (a 3 + ).…”

Section: Tunneling Mode Recombinationmentioning

confidence: 95%

“…Calculations by Guberman (66,67) and Sarpal et al (68), using the MQDT and R-matrix methods, respectively, have shown that the nonadiabatic coupling indeed is sufficiently strong to drive DR at a rate comparable to that measured in CRYRING. The framework for DR of HeH + that has emerged from the combined experimental and theoretical efforts has been challenged by a reinterpretation of the single-pass merged-beams results (70), which claims that low-energy DR occurs because of the presence in the ion beam of HeH + populating its lowest triplet state (a 3 + ). This is probably not a serious concern, since the calculated position and strength of a resonance depend sensitively on both the potential curves and the coupling strengths.…”

Section: Tunneling Mode Recombinationmentioning

confidence: 99%

Dissociative Recombination With Ion Storage Rings

Larsson

1997

Annu. Rev. Phys. Chem.

101

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The development of heavy-ion storage-cooler rings for atomic physics has made it possible to produce high-quality beams of molecular ions that are internally cold. The stored molecular-ion beam is immersed in a cold electron bath, which gives a beam of low divergence and small cross-sectional area. The electron cooler also serves as a target for electron-molecular ion collision experiments. This allows the study of dissociative recombination of cold molecules with respect to cross sections, branching ratios, and angular distributions at an unprecedented luminosity.

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Dissociative recombination ofHeH+: A reexamination

Cited by 40 publications

References 20 publications

Inelastic low-energy collisions of electrons with HeH+: Rovibrational excitation and dissociative recombination

Inelastic low-energy collisions of electrons with HeH+: Rovibrational excitation and dissociative recombination

Yield determination of OH(v=0,1) radicals produced by the electron-ion recombination of H3O+ ions

Dissociative Recombination With Ion Storage Rings

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