Ionization of atomic hydrogen

Fig. 5.8. The triple differential cross section for positron impact ionization of atomic hydrogen, expressed as a function of the energy of the ejected electron. The scattered positron and electron both emerge in the direction of the incident...

Fig. 5.10. Apparatus, not to scale, of Jones et al. (1993) for positron impact ionization of atomic hydrogen. Squares with crosses, Helmholtz coil shaded rectangles, stainless steel shielding black rectangles in beam line, lead shielding.

Fig. 5.11. Positron impact ionization of atomic hydrogen. Experiment , Jones...

Spicher, G., Olsson, B., Raith, W., Sinapius, G. and Sperber, W. (1990). Ionization of atomic hydrogen by positron impact. Phys. Rev. Lett. 64 1019-1022. 

C.R. Holt, M.G. Raymer, W.P. Reinhardt, Time dependences of two-, three-, and four-photon ionization of atomic hydrogen in the ground 12S and metastable 22S states, Phys. Rev. A 27 (6) (1983) 2971. 

Here we apply the coupled-channel method to calculate photo ionization of atomic hydrogen by short (femtosecond) laser pulses at high power densities (up to 5 X 10 " W/cm ). A classical electro-dynamical field approximates the laser/atom interaction, according to (in the Coulomb gauge)... 

Figure 3. Radial Lanczos functions of Equations (4) for Is-Hcp excitation and Ionization of atomic hydrogen (18) The abscissa spans 24 a, the ordinate 0.07 a.u.

Multiphoton Ionization of Atomic Hydrogen Using Perturbation Theory, E. Karate... 

Given that Jupiter s upper atmosphere consists mainly of molecular hydrogen, the major primary ion, which is formed by either photoionization or particle impact, is H J. H+ ions are also created by either dissociative ionization of H2 or by direct ionization of atomic hydrogen. At high altitudes, H+ can only recombine directly via radiative recombination, which is a very slow process. It was suggested some time ago that H+ could charge exchange, with H2 excited to a vibrational state v > 4. The vibrational distribution of H2 is not known, but recent calculations indicate that the vibrational temperature is elevated at Jupiter, but it is not clear how important this effect is. 

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