A Novel Mechanism for the Kossel Effect Due to Coherent X‐Ray Scattering in Periodic Amorphous Multilayers

A new mechanism for the the excitation of the Kossel effect is observed in periodic amorphous multilayers, where the X‐rays, scattered coherntly from atoms in the amorphous state, act as the sources within the one‐dimensional periodic multilayer. The Kossel effect, which is well described by the distorted‐wave Born approximation, is manifested as intensity modulations whenever the exit angle of the scattered beam equals any Bragg angle of the multilayer diffraction. While it is initially surprising for an amorphous sample, this Kossel effect must be treated by dynamical theory and will only occur for sharp interfaces between W and C sublayers.