ATOMIC DATA FROM THE IRON PROJECT .12. ELECTRON-EXCITATION OF FORBIDDEN TRANSITIONS IN V-LIKE IONS MNIII, FEIV, COV AND NIVI

Electron excitation collision strengths for fine-structure transitions involving the four lowest 3d(5) terms (S-6, (4)G, P-4, D-4) in vanadi um-like ions Mn III, Fe IV, Co V and Ni VI are calculated using R-matr ix techniques. All five sextet and quartet 3d(5) target terms are incl uded in the expansion of the total wavefunction. Fine-structure collis ion strengths are obtained from an algebraic transformation of the rea ctance matrices. These collision strengths are then averaged over a Ma xwellian velocity distribution to obtain effective collision strengths as a function of electron temperature. To our knowledge, these are th e first published data for these processes.