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A simplified model of electron-hydrogen scattering is considered in which all terms involving nonzero angular momenta are neglected. Elastic scattering and excitation cross sections for the 2s and 3s states are calculated for this model with the use of close-coupling expansion with four different pseudostate bases. Pseudothreshold structure is observed and removed. It is found that, after removal of this structure, the results agree quite well with each other and with exact results for this model which were given previously by Poet.

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The energy values of the autoionisation states (3h'l') of the N5+ ion are deduced from the analysis of ejected-electron spectra following the collisional electron charge transfer process between bare N7+ projectiles and various targets (He, H, and Ar). We compare these results with our ab initio theoretical calculations employing a fourteen-state pseudostate close-coupling scheme.