Integral and differential cross sections for electron impact ionization

Details Integral and differential cross sections for electron impact ionization Integral and differential cross sections for electron impact ionization

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..597c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. 597-600. Research supported by DOE.

Physics

Atomic Physics

20

Atomic Physics, Computational Astrophysics, Coulomb Collisions, Electron Impact, Ionization Cross Sections, Plasma Physics, Cosmic Plasma, Local Thermodynamic Equilibrium, Space Plasmas

Scientific paper

Calculated Coulomb-Born exchange cross sections for hydrogenic ions from 1s through 6h exist in the literature. In this paper, an analytic fit formula to these cross sections is derived by fitting simultaneously to n, l, and u where n is the principal quantum number, l is the orbital angular momentum, and u is the impact electron energy in threshold units. The resulting fit, which is easily integrated over a Maxwellian velocity distribution, reproduces the calculated cross sections to better than 10 percent. A prescription is given for applying the cross sections to nonhydrogenic ions. In addition, the cross sections differential with respect to the energy of the scattered electron are fitted.

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