A&A Supplement series, Vol. 122, April I 1997, 177-180
Received June 19; accepted July 15, 1996
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 ground term and the first excited term of neutral Fe are calculated. The model target atom includes the lowest three terms (, and ) together with four pseudostates (, , , ) 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 . The low-temperature form of the collision strength is established for the first time for Fe I.
keywords: atomic data