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Paper XLIX

Electron impact excitation of Fe XX
K. Butler and C.J. Zeippen
Astronomy & Astrophysics, 2001, Vol.372, pp.1078

Collisional data between 86 levels of the $n=2$ and $n=3$ complexes of N-like iron are presented. The data have been obtained in a Breit-Pauli relativistic approximation and include resonance contributions by the use of close-coupling wavefunctions. The R-matrix package described by Hummer et al. has been used to solve the close-coupling equations at several thousand energy points for an extensive target leading to collision strengths accurate to better than 20%.