Electron-impact excitation of Fe7+

Details Electron-impact excitation of Fe7+ Electron-impact excitation of Fe7+

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26as..142..317g&link_type=abstract

Astronomy and Astrophysics Supplement, v.142, p.317-323

Astronomy and Astrophysics

Astrophysics

14

Atomic Data, Sun: Corona

Scientific paper

Electron-impact excitation cross sections for Fe7+ are calculated using R-matrix close-coupling theory. The calculation includes 33 LS terms of the seven configurations: 3p63d, 3p53d2, 3p53d4s, 3p64s, 3p64p, 3p64d, and 3p64f. Following an intermediate-coupling frame transformation of the LS K-matrices, cross sections and effective collision strengths are obtained for 2926 transitions among 77 LSJ levels of the original seven configurations. After the solution of the corresponding collisional-radiative equations, the emission line ratio involving a blend of the 3p64f 2F -> 3p63d 2D transitions at around 131 A and another blend of the 3p53d2 2P -> 3p63d 2D and 3p53d2 2D -> 3p63d 2D transitions at around 168 A is found to provide a very useful electron-temperature diagnostic.

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