ATOMIC DATA FROM THE IRON PROJECT. XXV. ELECTRON IMPACT EXCITATION OF FINE-STRUCTURE TRANSITIONS IN THE GROUND CONFIGURATION OF FE XII

In the framework of the IRON Project we have performed new, fully quantum mechanical atomic calcula- tions for the Fe xii (Fe 11+ ) coronal ion. Energy levels, os- cillator strengths and spontaneous decay transition prob- abilities have been computed by including extensive con- guration interaction (CI) and relativistic eects in the solution of the atomic structure problem. The R-matrix approach has been employed to solve the electron scatter- ing problem and generate a new set of collisional atomic data. Results are discussed for the ten ne-structure for- bidden transitions in the 3s 2 3p 3 ground conguration of Fe xii, and compared with previous calculations.