Non equilibrium velocity distributions of H- ions in H2 plasmas and photodetachment measurements

Details Non equilibrium velocity distributions of H- ions in H2 plasmas and photodetachment measurements Non equilibrium velocity distributions of H- ions in H2 plasmas and photodetachment measurements

2007-05-30

arxiv.org/abs/0705.4420v1

Physics

Plasma Physics

17 pages, 8 figures

Scientific paper

A theoretical study of the energy distribution function of the negative hydrogen ion H- in typical conditions for multicusp ion sources is presented. The case of H/H2 mixture is studied by a Monte Carlo solution of the kinetic equation for H- transport. A simple analytical model is obtained for the case of a fully dissociated H plasma and uniform reduced electric field (E/N). Results are in good agreement with the two-group distribution deduced from laser photodetachment experiments and explain the low energy group as an effect of the charge exchange collisions of negative ions with H atoms.

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