A&A Supplement series, Vol. 122, April I 1997, 177-180
Received June 19; accepted July 15, 1996
4s
D ground state and the
3d
4s
F metastable state of Fe IJ. 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