Excitation of high-lying pair-rydberg states

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The energy dependence of the cross section for production of doubly excited ridge states by inelastic electron scattering off atoms or ions is analysed within the framework of configuration interaction theory. Specifically, a pure two-electron system (He) is considered, and the partial width for the inverse process of autoionization from a doubly excited state to the ground state continuum is calculated. As in earlier analyses, we find that the cross section behaves as σ ~ Np, where N denotes the doubly excited level. We determine the exponent to be p ≈-6.5, our analytical derivation of it being in good agreement with an actual numerical calculation of the relevant partial widths. This result is to be compared to a similar treatment of the process using the group theoretical doubly excited symmetry basis (desb) which yields P =-7. © 1995 IOP Publishing Ltd.

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Journal of Physics B: Atomic, Molecular and Optical Physics

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