Dielectronic recombination of heavy species: the tin 4p64dq 4p64d(q 1)4f + 4p54d(q + 1) transition arrays for q = 110

N R Badnell (1) , A Foster (1, 2) , D C Griffin (3) , D Kilbane (4) , M O 'Mullane (1) , H P Summers (1)

1 Department of Physics
2 CfA - Harvard-Smithsonian Center for Astrophysics
3 Department of Physics
4 School of Physics

recombination of heavy species: the tin 4p 6 4d q − 4p 6 4d (q−1) 4f + 4p 5 4d (q+1) transition arrays for q = 1 − 10 Abstract. We report-on detailed calculations of dielectronic recombination rate coefficients for Sn 4+ - Sn 13+ using three approaches of differing degrees of complexity. These are: configuration-mixed Breit-Pauli using the autostructure code, bundled-nl using the Burgess-Bethe General Program (BBGP) and configuration-average (CA) using the DRACULA code. We find that: target ∆n = 0 dipole promotions dominate the total dielectronic recombination rate coefficients ; configuration-mixing effects are small for the totals ; results for the totals are highly-dependent on the initial levels averagedover -- the results for averaging-over all levels of the ground configuration being typically nearly a factor of two smaller than for using only the ground level. On comparing total dielectronic recombination rate coefficients obtained using the three methods we find that the BBGP results are systematically lower than those obtained from autostructure -- in some cases they are significantly lower (by a factor of two) -- while the CA results are systematically and significantly higher (by up to 80%) in general. These findings need to be borne in mind for the finite-density modelling of tin plasma sources for microlithography and tin markers for magnetic fusion plasmas especially when using simple descriptions of dielectronic recombination. They apply also to heavy species in general such as Tungsten ions which are of great importance for magnetic fusion plasmas.

Mots clés: Physical Sciences

N R Badnell, A Foster, D C Griffin, D Kilbane, M O 'Mullane, et al.. Dielectronic recombination of heavy species: the tin 4p64dq 4p64d(q 1)4f + 4p54d(q + 1) transition arrays for q = 110. Journal of Physics B: Atomic, Molecular and Optical Physics, 2011, 19 (13), pp.135201-3835. ⟨10.1088/0953-4075/44/13/135201⟩. ⟨hal-00632297⟩