ELECTRON-IMPACT EXCITATION RATES FOR TRANSITIONS FROM THE 1S(2) S-1 GROUND-STATE TO THE N=2 AND N=3 LEVELS IN NI-XXVII

Collision strengths and Maxwellian averaged collision rates are calcul ated for intercombination and forbidden transitions from the (1)s(2 1) S ground state to the 1s2l and 1s3l levels in He-like NiXXVII, using the Dirac and Breit-Pauli R-matrix codes. The collision strength data at energies of E = 574 and E = 674 Rydbergs, and the collision rate da ta at log T-e = 7.2 and log T-e = 8.1 are compared with previous calcu lations and are generally found to be in good agreement, but to differ significantly in a few cases.