Calculations on the structure and corresponding permitted spontaneous transitions for the low-lying states of Fe(+24) and Fe(+25)

Details Calculations on the structure and corresponding permitted spontaneous transitions for the low-lying states of Fe(+24) and Fe(+25) Calculations on the structure and corresponding permitted spontaneous transitions for the low-lying states of Fe(+24) and Fe(+25)

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..443x&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 1, p. 443-447

Physics

Atomic Physics

6

Ferric Ions, Relativistic Plasmas, Spectral Emission, Spontaneous Emission, Atomic Physics, Atomic Structure

Scientific paper

Observations in recent years show that the line-link feature at approximately 6.7 keV, which is attributed to K-alpha line emission of Fe(+24) and sometimes Fe(+25), can be detected in various sources, while K-beta emission at approximately 7.9 keV is scarcely observed. It is evident that the detailed studies of these lines can markedly improve our understanding of the line-emitting regions, which consist of very hot plasmas. However, the main interest in this problem so far, either observational/experimental or theoretical, is focused on K-alpha lines, leaving other lines (including the next important K-beta lines) unstudied. In this paper, within the frame of relativistic perturbation, we adopt analytical wavefunctions under the intermediate coupling scheme to calculate thoroughly the structure and the corresponding permitted spontaneous transition rates for the low-lying states (n = 1, 2, 3) and the high-energy resonance lines of Fe(+24) (data for Fe(+25) are also listed). The calculation is relatively direct with accuracy adequate for astronomical uses. Particularly, the detailed data related to n = 3 states of Fe(+24) are first given in this paper.

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