Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-05
Astronomy and Astrophysics
Astrophysics
21 pages, 7 figures, 4 tables. accepted by J. Phys. B
Scientific paper
10.1088/0953-4075/41/23/235203
We present results for the inner-shell electron-impact excitation of Fe$^{15+}$ using the intermediate-coupling frame transformation {\it R}-matrix approach in which Auger-plus-radiation damping has been included. The target and close-coupling expansions are both taken to be the 134 levels belonging to the configurations ${\rm 2s^22p^63}l$, ${\rm 2s^22p^53s3}l$, ${\rm 2s^22p^53p^2}$ and ${\rm 2s^22p^53p3d}$. The comparison of Maxwell-averaged effective collision strengths with and without damping shows that the damping reduction is about 30-40% for many transitions at low temperatures, but up to 80% for a few transitions. As a consequence, the results of previous Dirac $R$-matrix calculations (Aggarwal and Keenan, 2008) overestimate the effective collision strengths due to their omission of Auger-plus-radiation damping.
Badnell Nigel R.
Liang Gui-Yun
Whiteford A. D.
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