Electron impact excitation of K shell electrons

Recently, Botero and Macek developed a new perturbation theory for electron atom scattering with arbitrary boundary conditions, resulting in a modified effective charge Coulomb-Born series, and applied it to the electron impact ionization of the K shell of light neutral atoms. We examine the utility of this approach in the case of electron impact excitation. We calculate the first term of this perturbation series (including exchange) and apply it to the excitation of K shell electrons to the L shell. We compare our results with data from scattering experiments on light elements