Resonance and intermediate-coupling effects in electron scattering with highly charged ions. I - Collision strengths for Fe(24+), Se(32+), and Mo(40+). II - Autoionization and dielectronic recombination

Details Resonance and intermediate-coupling effects in electron scattering with highly charged ions. I - Collision strengths for Fe(24+), Se(32+), and Mo(40+). II - Autoionization and dielectronic recombination Resonance and intermediate-coupling effects in electron scattering with highly charged ions. I - Collision strengths for Fe(24+), Se(32+), and Mo(40+). II - Autoionization and dielectronic recombination

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phrva..28.2113p&link_type=abstract

Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 28, Oct. 1983, p. 2113-2136. Research supported by the Na

Astronomy and Astrophysics

Astrophysics

32

Electron Scattering, Iron, Molybdenum, Oscillator Strengths, Plasma Resonance, Selenium, Astrophysics, Electron States, Ion Charge, Isoelectronic Sequence, Metal Ions, Optical Coupling, Resonance Scattering

Scientific paper

A study of electron-impact excitation of highly charged ions in the helium isoelectronic sequence is reported. Intermediate coupling collision strengths are calculated for all transitions, including the fine structure, that result from a nine-state target expansion in LS coupling. Relativistic effects are taken into account in the Breit-Pauli approximation. Higher partial waves are treated by the Coulomb-Bethe method using accurate relativistic eigenenergies and oscillator strengths for the target ions. The Z dependence of the departure from LS coupling is investigated. Autoionization and dielectronic recombination effects are described in detail for the energy range between the N = 2 and n = 3 states. Results are presented to illustrate particular features in a number of transitions in Fe(24+) and Mo(40+). It is shown that departure from LS coupling, resoance enhancement due to autoionization, and reduction in autoionization enhancement due to dielectronic recombination can be of considerable importance in the cross sections of highly ionized systems.

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