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A&A Supplement series, Vol. 122, April I 1997, 177-180

Received June 19; accepted July 15, 1996

Atomic data from the IRON Project

XXI. Electron excitation of fine-structure transitions involving the 3dtex2html_wrap_inline10014stex2html_wrap_inline1003D ground state and the 3dtex2html_wrap_inline10054stex2html_wrap_inline1007F metastable state of Fe I

J. Pelan - K.A. Berrington

Send offprint request: J. Pelan
Department of Applied Mathematics & Theoretical Physics, The Queen's University, Belfast, BT7 1NN, UK


Low energy electron excitation collision strengths for fine-structure transitions involving the tex2html_wrap_inline1009 ground term and the tex2html_wrap_inline1011 first excited term of neutral Fe are calculated. The model target atom includes the lowest three terms (tex2html_wrap_inline1013, tex2html_wrap_inline1015 and tex2html_wrap_inline1017) together with four pseudostates (tex2html_wrap_inline1019, tex2html_wrap_inline1021, tex2html_wrap_inline1023, tex2html_wrap_inline1025) chosen to represent the dipole polarizability of the ground term and first excited term of Fe. The Breit-Pauli R-matrix method is used to calculate the fine-structure collision strength, which is averaged over a Maxwellian velocity distribution to obtain effective collision strengths as a function of electron temperature in the range tex2html_wrap_inline1027. The low-temperature form of the collision strength is established for the first time for Fe I.

keywords: atomic data

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