Atomic data from the IRON Project. LXV. Electron-impact excitation of Fe6+

Details Atomic data from the IRON Project. LXV. Electron-impact excitation of Fe6+ Atomic data from the IRON Project. LXV. Electron-impact excitation of Fe6+

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...481..543w&link_type=abstract

Astronomy and Astrophysics, Volume 481, Issue 2, 2008, pp.543-551

Astronomy and Astrophysics

Astrophysics

13

Atomic Data

Scientific paper

We present R-matrix results for the electron-impact excitation of Fe6+. The intermediate-coupling frame transformation (ICFT) method has been used to obtain level-resolved collision strengths. We then calculate effective collision strengths assuming a Maxwellian distribution for the incident electron velocities. A large configuration interaction (CI) expansion of 1896 LS terms (4776 fine-structure levels) is used to obtain an accurate target. This is reduced to 89 close-coupling (CC) terms (189 levels) for the scattering calculation. To investigate the importance of CI, we also perform a second calculation with the same CC expansion but a smaller CI expansion. We discuss the difficulties of such a comparison and look at which transitions show the most sensitivity to the CI expansion. Our effective collision strengths are compared with a previous IRON Project report (Berrington et al. 2000, A&A, 142, 313) for transitions within the ground configuration and a recent distorted wave calculation (Zeng et al. 2005, MNRAS, 357, 440) for transitions to excited configurations. We find good agreement with the results of the previous R-matrix calculation and with the high-temperature distorted-wave results for most transitions, although there are some significant differences at lower temperatures in the latter case.

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