On the dielectronic recombination of Li-like Al

The author has calculated dielectronic recombination rate coefficients for Al 10+ using the AUTOSTRUCTURE code. The high-temperature zero-density results are in good agreement (30%) with those obtained from the general formula of Burgess (1965, 1969) and are a factor of 3.6 larger than the R-matrix results of Terao and Burke (1990). There are two reasons for this discrepancy. Firstly, the author obtains a nonnegligible contribution from high angular momentum (l>6) states, 40% of the total, unlike Terao and Burke. Secondly, the author's allowance for outer electron stabilization, which was neglected by Terao and Burke, increases the author's results by a factor of 1.65. The discrepancy increases to a factor of 10, or more, when dielectronic recombination is dominated by low-lying states as found in a high-density or low-temperature plasma.