Transfer ionization in He<sup>2+</sup>-H<sup>-</sup>collisions: cross section measurements in the energy range 0.2-1300 eV

Cherkani, M H; Szűcs, Sándor; Terao, M.; Hus, H; Brouillard, F.

doi:10.1088/0953-4075/24/1/022

Cited by 14 publications

(9 citation statements)

References 4 publications

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“…1. This experimental setup has already been described by de Ruette et al ( 2018) (MN detection system), Olamba et al (1996) (merged beam improvement), and Cherkani et al (1991) (merged beam system).…”

Section: Merged Beam Setupmentioning

confidence: 99%

Mutual Neutralization in Li⁺−D⁻ Collisions: A Combined Experimental and Theoretical Study

Launoy

Loreau

Dochain³

et al. 2019

ApJ

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We present a combined experimental and theoretical study of the mutual neutralization process in collisions of lithium ions (Li + ) with deuterium anions (D − ) at collision energies below 1 eV. We employ a merged-beam apparatus to determine total and state-to-state mutual neutralization cross sections. We perform nuclear dynamics calculations using the multi-channel Landau-Zener model based on accurate ab initio molecular data. We obtain an excellent agreement between the experimental and theoretical results over the energy range covered in this work. We show that the basis sets used in the ab initio calculations have a limited influence on the total cross section, but strongly impacts the results obtained for the partial cross sections or the reaction branching ratios. This demonstrates the important role of high-precision measurements to validate the theoretical approaches used to study gas-phase reactive processes. Finally, we compute mutual neutralization rate coefficients for Li + + H − and Li + + D − , and discuss their significance for astrochemistry models.

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Section: Merged Beam Setupmentioning

confidence: 99%

Mutual Neutralization in Li⁺−D⁻ Collisions: A Combined Experimental and Theoretical Study

Launoy

Loreau

Dochain³

et al. 2019

ApJ

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“…All these reactions require intermediate collision energy which suits perfectly the semi-empirical description of the collision. It is also the case for the charge transfer mechanism that involves H − ion as projectile (He 2+ + H − → H + He + (nl)) [16,17].…”

Section: Introductionmentioning

confidence: 99%

Ab initiocalculation ofH+He+charge-transfer cross sections for plasma physics

et al. 2010

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The charge transfer in low energy (0.25 to 150 eV/amu) H(nl) + He + (1s) collisions is investigated using a quasi-molecular approach for the n = 2, 3 as well as the first two n = 4 singlet states. The diabatic potential energy curves of the HeH + molecular ion are obtained from the adiabatic potential energy curves and the non-adiabatic radial coupling matrix elements using a two-by-two diabatization method, and a time-dependent wave-packet approach is used to calculate the stateto-state cross sections. We find a strong dependence of the charge transfer cross section in the principal and orbital quantum numbers n and l of the initial or final state. We estimate the effect of the non-adiabatic rotational couplings, which is found to be important even at energies below 1 eV/amu. However, the effect is small on the total cross sections at energies below 10 eV/amu. We observe that to calculate charge transfer cross sections in a n manifold, it is only necessary to include states with n ′ ≤ n, and we discuss the limitations of our approach as the number of states increases.

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“…For the collisional system H − + He ++ the one-electron charge exchange was studied in [8], and the transfer ionization with formation of He + + H + + e was investigated in [9] and analysed in [10]. The theory of the Li + (1s 2 ) + H − = Li(1s 2 , nl) + H(1s) reaction was considered in [11,12] and its measurements in [13,14].…”

Section: Introductionmentioning

confidence: 99%

One-electron charge exchange between and positive multiply charged ions. 1. Collisions

Chibisov

Brouillard²,

Chenu³

et al. 1997

J. Phys. B: At. Mol. Opt. Phys.

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The cross section for one-electron transfer H − + He + → H(1s) + He * (1s, nlm) is calculated in this paper. The collisional system is treated as a three-electron one and matrix elements for the formation of excited helium He * (1s, nlm) in both singlet and triplet states (1S, 2 1,3 S, P and 3 1,3 S, P, D) are obtained. Close-coupling calculations were done for the 27 1s, nlm| (1S, 2 1,3 S, P and 3 1,3 S, P, D) final states covering the range 1-10 × 10 7 cm s −1 of the relative collision velocity. An approximation is used for the effective potential of H − and Coulomb Green's functions are used to describe the weakly bound electron of H − . A satisfactory agreement is obtained with the experimental cross section.

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Transfer ionization in He²⁺-H^-collisions: cross section measurements in the energy range 0.2-1300 eV

Cited by 14 publications

References 4 publications

Mutual Neutralization in Li⁺−D⁻ Collisions: A Combined Experimental and Theoretical Study

Mutual Neutralization in Li⁺−D⁻ Collisions: A Combined Experimental and Theoretical Study

Ab initiocalculation ofH+He+charge-transfer cross sections for plasma physics

One-electron charge exchange between and positive multiply charged ions. 1. Collisions

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Transfer ionization in He2+-H-collisions: cross section measurements in the energy range 0.2-1300 eV

Cited by 14 publications

References 4 publications

Mutual Neutralization in Li+−D− Collisions: A Combined Experimental and Theoretical Study

Mutual Neutralization in Li+−D− Collisions: A Combined Experimental and Theoretical Study

Ab initiocalculation ofH+He+charge-transfer cross sections for plasma physics

One-electron charge exchange between and positive multiply charged ions. 1. Collisions

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Product

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Transfer ionization in He²⁺-H^-collisions: cross section measurements in the energy range 0.2-1300 eV

Mutual Neutralization in Li⁺−D⁻ Collisions: A Combined Experimental and Theoretical Study

Mutual Neutralization in Li⁺−D⁻ Collisions: A Combined Experimental and Theoretical Study