Abstract
SynopsisWe present sets of new atomic data for astrophysical and fusion plasma diagnostics. We calculate electron-impact excitation collision strengths and effective collisions strengths for the Be- and Mg-like isoelectronic sequences up to Krq+. We use the R-Matrix Intermediate-Coupling Frame Transformation method. We also study the accuracy of calculations for highly-excited states and give extrapolation rules to estimate the effective collision strengths and their error at high n. We demonstrate the importance of a well converged CI/CC expansion in the R-matrix calculation to get good quality results, mainly for highly-excited states.
Highlights
CHIANTI or OPEN- ally, extrapolation from good-quality data for ADAS, require continual ad- lower states gives a more accurate result than vancement as the demands of plasma modelers an unconverged calculation
To guarantee a good description of those levels, we require a good convergence of the Configuration Interaction (CI) basis set expansion of the target and the Close Coupling (CC) calculation
The CI basis set for the Be-like sequence includes a total of 238 intermediate coupling levels from the configurations 1s2 {2s2, 2s2p, 2p2}, and 1s2 2{s, p} nl, with n = 3 − 7 and l = s, p, d, f, g for n = 4, 5 and l = s, p, d for n = 6, 7
Summary
CHIANTI (www.chiantidatabase.org) or OPEN- ally, extrapolation from good-quality data for ADAS (open.adas.ac.uk), require continual ad- lower states gives a more accurate result than vancement as the demands of plasma modelers an unconverged calculation. Tion of the error associated with the extrapola-
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