THE IONIZATION OF HYDROGEN AND OF HYDROGENIC POSITIVE IONS BY ELECTRON IMPACT.
Research communication no. 5,
DOUGLAS AIRCRAFT CO INC HUNTINGTON BEACH CALIF ADVANCED RESEARCH LAB
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Calculations of the ionization cross sections of hydrogen and of hydrogenic positive ions are described in which the initial state is either the ground or the excited 2s state. The first procedures used are the Born ii and Born-exchange approximations. These results are compared with other theoretical calculations and with experimental data. It is seen that for the case of ionization of hydrogen from its ground state, none of the theoretical results is in good agreement with the experimental data. A certain defect of the theory is then corrected by adopting a third procedure for this case, in which an angle-dependent Coulomb potential is used in the description of the final state of the e-H ionization problem. It is then found that, despite the sounder theoretical footing of this latter calculation, no improved agreement with experimental data is obtained except in the near threshold region. Convenient formulae are presented which represent the best data for the ionization cross sections and the associated reaction rates for the case of an initial Maxwellian distribution of velocities. Author
- Atmospheric Physics
- Atomic and Molecular Physics and Spectroscopy
- Plasma Physics and Magnetohydrodynamics