Plasma screening effects on proton-impact excitation of positive ions

Details Plasma screening effects on proton-impact excitation of positive ions Plasma screening effects on proton-impact excitation of positive ions

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrva..35.1252s&link_type=abstract

Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 35, Feb. 1, 1987, p. 1252-1268.

Physics

General Physics

24

Atomic Excitations, Dense Plasmas, Fine Structure, Ion Impact, Positive Ions, Proton Impact, Argon Plasma, Electron Plasma, Electron Transitions, Helium Plasma, Neon

Scientific paper

An investigation is made of the role of plasma screening in fine-structure excitation of excited (n = 2) hydrogenic ions, He(+), Ne(9+), Ar(17+), and Fe(25+) in collisions with protons. Within the context of the semiclassical, impact-parameter formalism, both ion-sphere and Debye-Hueckel static screening models have been used. For certain plasma conditions, the former model is easily justified by arguments based on the ordering of various time scales; however, the latter model is more appropriate for many plasmas presently subject to spectroscopic analysis. Substantial (e.g., factor-of-10) reductions from unscreened cross-section values are readily achievable. Numerous qualitative trends exhibited by the screened cross sections are discussed, and empirical relations are obtained that roughly scale the cross sections for different charges of the target ion.

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