Neutral-stabilized electron–ion recombination in ambient helium gas

Cao, Yang; Johnsen, Rainer

doi:10.1063/1.460505

Cited by 23 publications

(15 citation statements)

References 13 publications

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“…At temperatures below about 100 K the three-body coefficient falls off with decreasing temperature and then approaches the three-body coefficient for neutral-stabilized recombination. For comparison, we have added experimental data points obtained by Dohnal et al 38 in plasmas that contained only atomic Ar + ions (in the absence of hydrogen) and those agree very well with earlier data 40 and with theory of neutral assisted collisional radiative recombination (N-CRR, see section 3). At higher temperatures, the latter recombination mechanism makes only a negligible recombination.…”

Section: Experimental Data On the Temperaturementioning

confidence: 61%

“…Lower data set: measured heliumassisted collisional radiative recombination rate coefficient of Ar + ions (Dohnal et al 38 ), and earlier results of Cao and Johnsen. 40 + ions with gas temperature (Kotri ́k et al, 21 Dohnal et al 26 ). Lower data set: measured helium-assisted collisional radiative recombination rate coefficient of Ar + ions (Dohnal et al 38 ) and earlier results of Cao and Johnsen.…”

Section: Experimental Data On the Temperature Dependence Of The Heliu...mentioning

confidence: 99%

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Ternary Recombination of H₃⁺ and D₃⁺ with Electrons in He–H₂ (D₂) Plasmas at Temperatures from 50 to 300 K

et al. 2013

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We present results of plasma afterglow experiments on ternary electron-ion recombination rate coefficients of H3(+) and D3(+) ions at temperatures from 50 to 300 K and compare them to possible three-body reaction mechanisms. Resonant electron capture into H3* Rydberg states is likely to be the first step in the ternary recombination, rather than third-body-assisted capture. Subsequent interactions of the Rydberg molecules with ambient neutral and charged particles provide the rate-limiting step that completes the recombination. A semiquantitative model is proposed that reconciles several previously discrepant experimental observations. A rigorous treatment of the problem will require additional theoretical work and experimental investigations.

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Section: Experimental Data On the Temperaturementioning

confidence: 61%

Section: Experimental Data On the Temperature Dependence Of The Heliu...mentioning

confidence: 99%

Ternary Recombination of H₃⁺ and D₃⁺ with Electrons in He–H₂ (D₂) Plasmas at Temperatures from 50 to 300 K

et al. 2013

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“…The fact that the neutral-stabilized recombination can sometimes play a role was predicted many years ago by Bates and Khare [20] and confirmed for some ions (but not for H + 3 ) by experiments [21,22]. The typical value for the three-body recombination rate coefficient K He with helium as an ambient gas obtained in experiment and estimated theoretically [21,22] is of order of 10 −27 cm 6 s −1 at 300 K. Thus, at pressures of 1300 Pa, the corresponding apparent binary recombination rate coefficient is smaller than 10 −9 cm 3 s −1 , which would therefore be negligible in comparison with the now-accepted binary H + 3 recombination rate coefficient [8,9,10,11,18]. This would also be negligible in comparison with the bi-nary rate coefficients (about 10 −7 cm 3 s −1 at 300 K) for the majority of molecular ions.…”

Section: Introductionmentioning

confidence: 77%

Temperature dependence of binary and ternary recombination ofH3+ions with electrons

et al. 2009

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We study binary and the recently discovered process of ternary He-assisted recombination of H 3 + ions with electrons in a low-temperature afterglow plasma. The experiments are carried out over a broad range of pressures and temperatures of an afterglow plasma in a helium buffer gas. Binary and He-assisted ternary recombination are observed and the corresponding recombination rate coefficients are extracted for temperatures from 77 to 330 K. We describe the observed ternary recombination as a two-step mechanism: first, a rotationally excited long-lived neutral molecule H 3 ‫ء‬ is formed in electron-H 3 + collisions. Second, the H 3 ‫ء‬ molecule collides with a helium atom that leads to the formation of a very long-lived Rydberg state with high orbital momentum. We present calculations of the lifetimes of H 3 ‫ء‬ and of the ternary recombination rate coefficients for para-and ortho-H 3 + . The calculations show a large difference between the ternary recombination rate coefficients of ortho-and para-H 3 + at temperatures below 300 K. The measured binary and ternary rate coefficients are in reasonable agreement with the calculated values.

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“…Ternary electron-ion recombination was predicted by Thomson 55 and by Bates and Khare 56 and observed in experiments. [57][58][59] The ternary recombination of D 3…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of binary and ternary recombination of D3+ ions with electrons

Kotrík

Dohnal

Korolov

et al. 2010

The Journal of Chemical Physics

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Flowing and stationary afterglow experiments were performed to study the recombination of D(3)(+) ions with electrons at temperatures from 77 to 300 K. A linear dependence of apparent (effective) binary recombination rate coefficients on the pressure of the helium buffer gas was observed. Binary (D(3)(+)+e(-)) and ternary (D(3)(+)+e(-)+He) recombination rate coefficients were derived. The obtained binary rate coefficient agrees with recent theoretical values for dissociative recombination of D(3)(+). We describe the observed ternary process by a mechanism with two rate determining steps. In the first step, a rotationally excited long-lived neutral D(3)* is formed in D(3)(+)-e(-) collisions. As the second step, the D(3)* collides with a helium atom that prevents autoionization of D(3)*. We calculate lifetimes of D(3)* formed from ortho-, para-, or metastates of D(3)(+) and use the lifetimes to calculate ternary recombination rate coefficients.

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Neutral-stabilized electron–ion recombination in ambient helium gas

Cited by 23 publications

References 13 publications

Ternary Recombination of H₃⁺ and D₃⁺ with Electrons in He–H₂ (D₂) Plasmas at Temperatures from 50 to 300 K

Ternary Recombination of H₃⁺ and D₃⁺ with Electrons in He–H₂ (D₂) Plasmas at Temperatures from 50 to 300 K

Temperature dependence of binary and ternary recombination ofH3+ions with electrons

Temperature dependence of binary and ternary recombination of D3+ ions with electrons

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Neutral-stabilized electron–ion recombination in ambient helium gas

Cited by 23 publications

References 13 publications

Ternary Recombination of H3+ and D3+ with Electrons in He–H2 (D2) Plasmas at Temperatures from 50 to 300 K

Ternary Recombination of H3+ and D3+ with Electrons in He–H2 (D2) Plasmas at Temperatures from 50 to 300 K

Temperature dependence of binary and ternary recombination ofH3+ions with electrons

Temperature dependence of binary and ternary recombination of D3+ ions with electrons

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Ternary Recombination of H₃⁺ and D₃⁺ with Electrons in He–H₂ (D₂) Plasmas at Temperatures from 50 to 300 K

Ternary Recombination of H₃⁺ and D₃⁺ with Electrons in He–H₂ (D₂) Plasmas at Temperatures from 50 to 300 K