Velocity Distribution of $\hbox{H}^{-}$ Ions in Low Temperature Hydrogen Plasma
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.
ANALYTIC CROSS SECTIONS FOR COLLISIONS OF H+, H2+, H3+, H, H2, AND H− WITH HYDROGEN MOLECULES
Abstract Analytic expressions fitted to cross section data on collisions of H + , H + 2 , H 3 + , H, H 2 , and H − with H 2 are given. The data used are those recommended by Phelps [J. Chem. Phys. Ref. Data 19 , 653 (1990)] and additional experimental data, when available, up to a projectile energy of about 100 keV, including new kinds of reactions not treated by Phelps. The analytic expressions are of the semiempirical functional forms proposed by Green and McNeal [J. Geophys. Res. 76 , 133 (1971)] and modifications of these, thus making it possible not only to interpolate but also to extrapolate the data to some extent.
REACTIONS OF H(+) IN H2 AND D(+) IN D2; MOBILITIES OF HYDROGEN AND ALKALI IONS IN H2 AND D2 GASES,
Abstract : The results of a study of the transport and reaction properties of low-energy ions in hydrogen and deuterium gases are presented. The measurements included mobilities of D(+) and D3(+) ions in deuterium gas, the mobilities of the alkali ions Li(+), Na(+), and K(+) in H2 and D2 gases, and the reaction rate coefficients for the three-body ion-molecule reactions H(+) + H2 + H2 to H3(+) + H2; and D(+) + D2 + D2 to D3(+) + D2. In addition, a few data were gathered for the radial, or lateral, diffusion coefficient of H3(+) ions in H2 gas in order to attempt to resolve a large discrepancy between the published results of two other laboratories.