ELECTRON-IMPACT EXCITATION OF NI-XIX USING THE R-MATRIX METHOD

Collision strengths for all the transitions between the 15 lowest states of neon-like Ni XIX have been calculated for electron impact in the 80-140 Ry energy range. Configuration-interaction wavefunctions have been used to represent the target states. The standard R-matrix code has been used to calculate the lower scattering partial waves (L less than or equal to 9), while a no-exchange version of the same code has been used to compute efficiently the higher partial waves (L greater than or equal to 10). Effective collision strengths for 105 excitation transitions between the ground state 2s(2)2p(61)S(e) and the,142s(2)2p(5)3l Rydberg states are tabulated for electron temperatures in the range log T = 5.40 to log T = 7.00, with T expressed in degrees K.