Theoretical study of the satellite structure in the photoelectron spectra of neon and argon

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Abstract
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 both for 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. The spectroscopic factor of the 3p43d satellite in Ar is discussed, and available evidence is found to support the value measured by X-ray photoelectron spectroscopy.