Collision strengths in S III

We considered 49 fine-structure levels arising from the 27 LS 3s^2^3p^2^ ^3^P, ^1^D, ^1^S, 3s3p^3^ ^5,3^S_o_, ^1,3^D_o_, ^1,3^P_o_, 3s^2^3p3d ^1,3^P_o_, ^1,3^D_o_, ^1,3^F_o_, 3s^2^3p4s ^1,3^P_o_, 3s^2^3p4p ^1,3^S, ^1,3^P, ^1,3^D, 3s^2^3p4d ^1,3^P_o_, and ^1,3^D_o_ states.

These target levels are represented by fairly extensive configuration-interaction wave functions. The collision strengths for transitions between fine-structure levels are calculated by transforming the LS-coupled K-matrices to K-matrices in an intermediate coupling scheme. Complicated resonance structures converging to excited state thresholds are explicitly included in collision strengths.