Atomic data from the IRON Project. LII. Electron excitation of Ni+24

Details Atomic data from the IRON Project. LII. Electron excitation of Ni+24 Atomic data from the IRON Project. LII. Electron excitation of Ni+24

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...401.1177c&link_type=abstract

Astronomy and Astrophysics, v.401, p.1177-1183 (2003)

Astronomy and Astrophysics

Astrophysics

6

Atomic Data

Scientific paper

This paper reports on the calculation of collision strengths for electron induced transitions in the beryllium-like ion Ni XXV whose ground state is 1s2 2s2 1S0. We make use of the R-matrix method in conjunction with the intermediate frame coupling transformation (IFCT). The target has 98 fine structure states 1s2 nl n'l' SLJ corresponding to n = 2 and n' = 2, 3, 4 . Our calculation extends up to 440 Ry with respect to the ground state. In order to obtain reliable rate coefficients at high temperatures (T above 2 x 107 K) we have extended our collision strengths to much higher energies by using a variety of techniques, including use of Burgess's interactive code OmeUps. The effective collision strength Upsilon is tabulated against log T for the 45 transitions linking the lowest 10 levels. We also give results for 5 transitions in the X-ray region which are needed in solar studies. The temperature range 6.3 <=log T <=8.3 is centred on log T = 7.1 which is where this ion has its maximum coronal abundance.
Figures 1 to 8, and Appendix A are only available in electronic form at http://www.edpsciences.org

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