Electron impact excitation in Fe XI

The 38 fine-structure levels arising from the 20 LS states 3s^2^3p^4^ ^3^P, ^1^D, ^1^S; 3s3p^5^ ^3^P^0^, ^1^P^0^; 3s^2^3p^3^(^4^S^0^)3d ^3^D^0^, 3s^2^3p^3^(^2^P^0^)3d ^1,3^P^0^, ^1,3^D^0^, ^1,3^F^0^, 3s^2^3p^3^(^2^D^0^)3d ^1,3^S^0^, ^1,3^P^0^, ^1,3^D^0^, ^1,3^F^0^ are included in our calculation.

The target levels are represented by configuration interaction wave functions. The relativistic effects are considered in the Breit-Pauli approximation by including one-body mass correction, Darwin term, and spin-orbit terms in the scattering equations. Collision strengths for transitions from the 3s^2^3p^4^ ^3^P_2,1,0_ levels to the fine-structure levels of the 3s^2^3p^3^3d configuration are compared with the distorted-wave results of Bhatia & Doschek (1996) at 8.0, 16.0, 24.0 ryd.