Multielectron transitions above the kryptonKedge

Abstract
The structures above the Kr K edge are reported and for the first time interpreted as due to multielectron transitions involving K, M, and N electrons. The cross section of the 1s3d multielectron transition is analyzed and an onset more rapid than the one expected according to the ‘‘shake’’ model is observed. This behavior is quite well described by a model proposed by Stöhr, Jaeger, and Rehr [Phys. Rev. Lett. 51, 821 (1983)] based on the exchange interaction.