Abstract
The electron impact excitation of He-like ions is studied using an equivalent-electron frozen-core approximation that was developed in an earlier paper on He. The resulting collision equations are solved using a five-state Coulomb exchange distorted-wave approximation that includes the dominant monopole exchange distorting potential exactly. Results are presented for scaled total collision strengths for all inelastic transitions between the 11S, 23S, 21S, 23P and 21P states of Li+, Be2+, B3+, C4+, N5+, O6+, Ne8+, Mg10+, Si12+, Ca18+ and Fe24+, as well as for the infinite Z limit, for incident electron energies from threshold up to 4.0Z2 Ryd. The present results are in good agreement with those of close-coupling and distorted-wave calculations by other workers for transitions from the ground state in O6+.
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