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Velocity Distribution of \hbox {H}^{-} Ions in Low Temperature Hydrogen Plasma

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2 Author(s)
Diomede, Paola ; Dept. of Chem., Bari Univ., Bari ; Longo, Savino

A Monte Carlo solution of the Boltzmann equation is applied to the calculation of the velocity distribution of negative atomic ions H- in uniform H/H2 plasmas in a wide parameter range. Results are shown for the energy distribution n(epsiv), the 2-D velocity distribution, and the energy-dependent coefficients of the spherical harmonics expansion of its angular part, for different values of the reduced electric field E/N, the atomic fraction, and the H+ mole fraction. By increasing E/N or the atomic fraction at constant ion energy, the velocity distribution becomes highly anisotropic, and at same time, n(epsiv) features a suprathermal tail consistent with analytical results.

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Plasma Science, IEEE Transactions on  (Volume:36 ,  Issue: 4 )