Theoretical study of the satellite structure in the photoelectron spectra of Neon and Argon

CI calculations are performed for the lowest satellite states in the valence and core photoelectron spectra of Ne and Ar, at various excitation levels, up to 4h-3p/4h-4p. Use of relaxed orbitals relative to the doubly ionized system gives significant improvement at the lowest excitation level, and is subsequently employed in all calculations. <good agreement is obtained for both the energies and intensities, although the latter appear generally underestimated. A better agreement is obtained by the use of the sudden approximation including a plane-wave description of the photoelectron.