Abstract
The threshold exponent α0 of anomalous soft X-ray absorption spectra of metallic Cs in the theory of Nozières and De Dominicis is calculated. The value of α0 for Cs is obtained experimentally as 0.06 or 0.07 which is considerably smaller than those for K and Rb and could not have been explained even qualitatively by predecessors. By a proposed model the localized 4f-orbital is pulled in by the 5p-hole that is created by absorption of a soft X-ray, resulting in the screening of the 5p-hole. From this model we obtained the value of α0 = 0.05, in agreement qualitatively with the experimental results. For K and Rb, the obtained values for α0 in the present study are 0.27 and 0.25, respectively, in satisfactory agreement with the experimental results.
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