Electron detachment for collisions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">D</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>with hydrogen molec

Huq, M. Saiful; Doverspike, L. D.; Champion, R. L.

doi:10.1103/physreva.27.2831

Cited by 61 publications

(36 citation statements)

References 18 publications

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“…The following three extinction processes of H − and the elastic collision with neutral particles are considered by using the Monte Carlo method in each time step: ͑1͒ collision with electrons, H − + e → H+2e, ͑2͒ mutual neutralization, H − +H + → 2H, and ͑3͒ collision with H, H − +H → H 2 + e and H − +H→ 2H + e. In addition to these collisional processes, Coulomb collisions with electrons and positive ions are considered. 42,43 The extinction process due to the collision with H 2 is neglected because the extinction rate is substantially lower than that of the collision with H. 44,45 The extinction due to the collision with the chamber wall, which occurs due to the effect of the parallel transport, is considered in each time step by the Monte Carlo method. The extinction probability due to the parallel transport can be determined from the ratio of the negative ion flux toward the wall to the total negative ions.…”

Section: A Simulation Modelmentioning

confidence: 99%

Effect of cross-field transport on H− density profile in magnetized plasmas: Comparison between measurement and simulation

et al. 2007

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The radial density profile of negative hydrogen ions in magnetized plasma is investigated in the divertor simulator MAP (Material and plasma)-II [S. Kado et al., J. Plasma Fusion Res. 71, 810 (2005)] by measurement and numerical simulation. The laser photodetachment method is used to evaluate the H− density by considering the influence of the magnetic field. The density of H− has a hollow profile and exhibits a peak in the peripheral region, though the electron density and temperature exhibit a peak at the center of the plasma column. The density profile of H− does not agree with the calculation result obtained from the rate equation, in which the local production and extinction rates are balanced, under the present experimental condition. To understand the behavior of negative ions, their trajectories are calculated by numerically solving the equation of motion by considering the effect of collisions. The negative ion density profile calculated from the particle simulation agrees well with the measured negative ion density profile. It is shown that the cross-field H− transport due to the radial electric field with the assistance of the elastic collisions plays an important role in enhancing the negative ion density in the peripheral region.

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Section: A Simulation Modelmentioning

confidence: 99%

Effect of cross-field transport on H− density profile in magnetized plasmas: Comparison between measurement and simulation

et al. 2007

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“…The ion-molecule reaction has been extensively studied recently [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Being a typical ion-molecule reaction, H À þ H 2 and its isotopic reactions are of interest in understanding the collision processes in interstellar media, the plasma, and high-energy physic studies [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Theoretical calculation of the integral cross-sections of the reaction H⁻ + H₂ → H₂ + H ⁻and its isotopic variants

Wang

2007

Molecular Physics

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The dynamics of H À þ H 2 reaction and the isotopic variant reactions have been studied extensively by means of the quasi-classical trajectory (QCT) calculation. The reactive probability values of the reaction H À þ H 2 ! H 2 þ H À are calculated, and are consistent with the theoretical results reported by Sathyamurthy et al. The cross-sections of the reaction H À þ H 2 !H 2 þ H À and the isotopic variant reactions were calculated as functions of the collision energy in the range 0.4-2.4 eV. The product branching ratios of the reactions of H À þ HD and D À þ HD are also calculated. The computed results predicted that the H2 / HD ( HD = D2 HD / D2 ) sensitively depends on the collision energy and the values of the branching ratios are nearly equal to one at higher energies.

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“…Many researchers have paid attention to this reaction and its isotopic variants, the reaction cross-section for the collisions of H À and D À with H 2 , D 2 , and HD was measured by the means of the tandem mass spectrometer (TMS) [6]. Huq et al [7] measured the total reaction cross-sections for the reactive and the electron detachment channels. The integral reaction cross-section for (H À , D 2 ) collisions was determined by Zimmer and Linder [8] with the crossed beam techniques.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of the stereodynamics of the reactions of D−+H2→H−+HD and H−+D2→D−+HD

Wang

Yang

et al. 2007

Chemical Physics

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Electron detachment for collisions ofH−andD−with hydrogen molec

Cited by 61 publications

References 18 publications

Effect of cross-field transport on H− density profile in magnetized plasmas: Comparison between measurement and simulation

Effect of cross-field transport on H− density profile in magnetized plasmas: Comparison between measurement and simulation

Theoretical calculation of the integral cross-sections of the reaction H⁻ + H₂ → H₂ + H ⁻and its isotopic variants

Theoretical study of the stereodynamics of the reactions of D−+H2→H−+HD and H−+D2→D−+HD

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Electron detachment for collisions ofH−andD−with hydrogen molec

Cited by 61 publications

References 18 publications

Effect of cross-field transport on H− density profile in magnetized plasmas: Comparison between measurement and simulation

Effect of cross-field transport on H− density profile in magnetized plasmas: Comparison between measurement and simulation

Theoretical calculation of the integral cross-sections of the reaction H− + H2 → H2 + H −and its isotopic variants

Theoretical study of the stereodynamics of the reactions of D−+H2→H−+HD and H−+D2→D−+HD

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Theoretical calculation of the integral cross-sections of the reaction H⁻ + H₂ → H₂ + H ⁻and its isotopic variants