Atomic data from the IRON Project. XLI. Electron excitation rates among the 3d2 fine-structure levels of Ca-like Fe VII

Details Atomic data from the IRON Project. XLI. Electron excitation rates among the 3d2 fine-structure levels of Ca-like Fe VII Atomic data from the IRON Project. XLI. Electron excitation rates among the 3d2 fine-structure levels of Ca-like Fe VII

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26as..142..313b&link_type=abstract

Astronomy and Astrophysics Supplement, v.142, p.313-316

Astronomy and Astrophysics

Astrophysics

13

Atomic Data

Scientific paper

Electron excitation collision strengths of 3d2 fine-structure transitions in Ca-like Fe vii are calculated using an R-matrix method, which included the 80 terms arising from the 3d2, 3d4s, 3d4p, 3d4d, 3d4f and 3p53d3 configurations. Extensive autoionizing resonance structures together with channel coupling is therefore explicitly included; relativistic effects are accounted for by a term-coupling transformation. A thermal average is taken to obtain the effective fine-structure collision strength as a function of electron temperature T, for log T(K) = 4.3-6. Open 3p-shell resonances are seen to considerably enhance the background collision strength, by several factors for some of the 3d2_{j-> j'} transitions.

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