Effect of resonances on the excitation rates of He-like Fe XXV ion

Details Effect of resonances on the excitation rates of He-like Fe XXV ion Effect of resonances on the excitation rates of He-like Fe XXV ion

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phrva..31.3672f&link_type=abstract

Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 31, June 1985, p. 3672-3676.

Physics

General Physics

25

Atomic Excitations, Iron, Metal Ions, Metallic Plasmas, Plasma Spectra, Resonance Lines, Atomic Energy Levels, Autoionization, Forbidden Transitions, Helium, High Temperature Plasmas

Scientific paper

The He-like effective excitation rates of Fe-26 XXV are calculated, taking the effect of the autoionizing states 1s3l'nl (with n = 3 or greater) into account. Excitation-rate coefficients are determined exactly for n = 3, 4, and 5 and by extrapolation for n greater than 5, and the results are presented in tables. It is shown that the 1s3l'nl states are more important in determining the excitation-rate coefficients than the 1s2l'nl states (but still much less important than the radiative-cascade effects), affecting mainly the direct excitation of the forbidden z line and becoming less effective as temperature decreases.

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