Electron impact excitation rates for transitions from the 1s2 1S ground state to the n = 2 and 3 levels in Ni XXVII

Abstract

Listen

Translate article

Collision strengths and Maxwellian averaged collision rates are calculated for intercombination and forbidden transitions from the 1s2 1S ground state to the 1s2l and 1s3l levels in He-like Ni XXVII, 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 data at log Te = 7.2 and log Te = 8.1 are compared with previous calculations and are generally found to be in good agreement, but to differ significantly in a few cases.