Impact excitation of the n = 2 fine-structure levels in hydrogenlike ions by protons and electrons

Details Impact excitation of the n = 2 fine-structure levels in hydrogenlike ions by protons and electrons Impact excitation of the n = 2 fine-structure levels in hydrogenlike ions by protons and electrons

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrva..35.4085z&link_type=abstract

Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 35, May 15, 1987, p. 4085-4100. DOE-supported research.

Physics

General Physics

34

Atomic Excitations, Electron Impact, Hydrogen Plasma, Plasma Density, Positive Ions, Proton Impact, Argon, Carbon, Helium, Magnesium, Sulfur

Scientific paper

Quantal close-coupling calculations of the impact excitation of the n = 2 fine-structure levels in the hydrogenline ions Ar(17+), S(5+), Mg(11+), C(5+), and He(+) by protons and electrons are presented, and the resulting cross sections and rate coefficients are compared with previous values. The effects of relativity on the proton-impact excitation cross sections for ions with high nuclear charge are investigated. Plasma-density effects on the transition cross sections are explored using a Debye-screening model, and it is shown that the screening of the ion alters the excitation cross sections substantially and brings the ratio of the cross sections toward the statistical value. The calculated transition rates are used to model the ratio of the intensities of the two components of Ly-alpha radiation emitted by impurity hydrogenlike ions in an optically thin, hydrogen plasma. The results confirm that at intermediate plasma densities proton-impact-induced transitions redistribute the n = 2 fine-structure-level population ratio away from the statistical value.

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