Europhys. Lett.
Volume 74, Number 4, May 2006
Page(s) 616 - 622
Section Atomic and molecular physics
Published online 12 April 2006
Europhys. Lett., 74 (4), pp. 616-622 (2006)
DOI: 10.1209/epl/i2005-10576-1

Mutual neutralization of $\mth{H_{3}^{ + }}$ and $\mth{H^{ - }}$ ions in slow collisions

R. K. Janev1, C. L. Liu2, J. G. Wang2 and J. Yan2

1  Macedonian Academy of Sciences and Arts - P.O. Box 428, 1000 Skopje, Macedonia
2  Institute of Applied Physics and Computational Mathematics P.O. Box 8009-57, Beijing, PRC

received 29 November 2005; accepted in final form 21 March 2006
published online 12 April 2006

The process of mutual neutralization of H3 + and H - ions in the CM collision energy range $0.1\un{eV} / u\tx{--}10\un{keV} / u$ is studied within the multi-channel Landau-Zener model. From the multitude of covalent $H_3^\ast +
H(1s)$ states only the states (2s) 2A'1, (3s) 2A'1 and (3d)2A'1 are strongly coupled with the initial ionic H3 + + H - state. The total mutual-neutralization cross-section has a broad maximum around $E_{CM} =1\un{keV} / u$ of about $3\times 10^{ - 15}\un{cm}^{2}$, and below $\sim 100\un{eV} / u$ it monotonically increases with decreasing the collision energy, surpassing a value of $\sim 3\times 10^{ - 13}\un{cm}^2$ below $E_{CM} =
0.1\un{eV}/ u$. The mutual neutralization of H3 + and H - ions is, therefore, an important process in cold hydrogen plasmas.

34.10.+x - General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.).
34.70.+e - Charge transfer.

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