Abstract
A general formulation of the variational R-matrix method combined with multi-channel quantum defect theory is presented allowing the full (N+1)-electron problem to be treated to describe resonant photoionisation of atoms and electron-atom scattering. Using this method the authors have investigated the photoionisation of He in the photon energy range from 58.2 to 65.3 eV containing the doubly excited 1Po states of He converging to the He+ (n=2) threshold. Photoionisation cross sections have been calculated with high efficiency over a large energy range. In addition the Fano profile parameters have been extracted from the computed spectra and compared with experiment.
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