Abstract
A Coulomb-Born distorted-wave approximation, in which allowance is made for the distortion of partial waves by direct multipole potentials, has been used to evaluate the excitation cross section of ${\mathrm{Mg}}^{+}$ by electron impact. The calculations have been carried out using a unitarized four-state approximation (3s-3p-4s-3d) for the incident energy range 4--135 eV. The problem has been formulated in the LS coupling scheme, with the target ion being represented by a core plus atomic electron (frozen-core approximation) and exchange between the atomic and the incident electron being neglected. For the optically forbidden 3s-3d and 4s-3d transitions a simple analytic formula has been derived to estimate the contribution to the total collision strength from large values of angular momentum.
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