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Dielectronic recombination of Au20+ : a theoretical description of the resonances at low electron energies

Ballance, C. P. and Griffin, D C and Loch, S D and Badnell, N. R. (2012) Dielectronic recombination of Au20+ : a theoretical description of the resonances at low electron energies. Journal of Physics B: Atomic, Molecular and Optical Physics, 45. ISSN 0953-4075

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In recent years, there has been significant interest in the dielectronic recombination (DR) of complex ions involving open d and open f subshells. Experimental measurement of DR in Au25 + (Hoffknecht et al 1998 J. Phys. B: At. Mol. Opt. Phys. 31 2415) and W20 + (Schippers et al 2011 Phys. Rev. A 83 012711), both with ground configurations of 4p64d104f8, revealed extremely large and broad resonances at low electron energies. DR in such ions is very difficult to describe in detail theoretically because of the complexity of the recombining resonant states and the source of these resonant structures has not been fully explained for the aforementioned ions. However, a very recent measurement of DR in Au20 + (Schippers et al 2011 Phys. Scr. T 144 014039) with a ground configuration of 4p64d104f13 displayed very large but narrower resonances in the low-energy region. With the somewhat reduced complexity of the recombining resonances in this ion, we have been able to complete the first full intermediate-coupling level-resolved DR calculation for Au20 +. In the low-energy region, we find excellent agreement with the experimental measurements, and have been able to show that the DR rate coefficient in this ion is completely dominated by Δn = 1 transitions and that the low-energy resonances are primarily due to recombining levels of the 4d104f125lnl' configurations as suggested by Schippers et al (2011 Phys. Scr. T 144 014039) based on atomic structure calculations