Abstract
Calculations are described of the interaction between the nsnp6 2S term and the ns2np4md/ epsilon d2S series in atoms isoelectronic with the halogens, particularly the rare gases. For the halogens, it has been found earlier that the interaction with the continuum d series is crucial for a correct description of the term structure. A similar, although weaker, effect of the continuum is established for the rare gases. Detailed results for the admixture of nsnp6 2S in bound and continuum d states are reported for Cl I, Ar II, K III and Kr II. Only in K III is the effect of the continuum found to be negligible. The present results are important for the interpretation of satellite structures connected with the ejection of an ns electron from the rare gases. It is shown that there is good agreement between the present calculations and the satellite intensities in photoelectron experiments. The experimental uncertainties in photoelectron experiments are at present the limiting factors in the comparison and the need for better experimental values in order to test the calculations is stressed. Disagreements are found between the calculations and the results of (e, 2e) experiments. These disagreements are attributed to difficulties in the interpretation of the (e, 2e) experiments.

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