Electron-impact excitation of Sc II

New large-scale calculations for electron impact excitation collision strengths and radiative parameters for Sc II spectral lines between the 145 fine-structure levels belonging to the 3p⁶3d², 3p⁶3d4l (l=0-3), 3p⁶3d5l (l=0-3), 3p⁶3d6s, 3p⁶4s², 3p⁶4s4l (l=0-3), 3p⁶4s5l (l=0-1), and 3p⁶4p² configurations have been performed. Accurate description of the target wave functions and adequate account of the various interactions between target levels have been determined by a combination of the multiconfiguration Hartree-Fock (MCHF) and the B-spline box-based close-coupling methods together with the nonorthogonal orbitals technique. The valence electron wave functions are described by multichannel expansions in a B-spline basis and are subjected to a boundary condition to become negligible at the boundary. The calculations of collision strengths have been performed using the close-coupling approximation based on the B-spline Breit-Pauli R-matrix method [1]. The relativistic effects in the scattering calculations have been incorporated in the Breit-Pauli Hamiltonian using the one-body Darwin, mass correction, and spin-orbit operators. The likely uncertainties in our results have been estimated by means of comparison with other calculations and experimental radiative parameters. [1] O. Zatsarinny 2006 Comp. Phys. Commun. 174 273.