Kronig‐Structure Variations in the X‐RayK‐Absorption Spectra of a Cu Single Crystal

Abstract
The Kronig structure on the high‐frequency side of the x‐ray K‐absorption edge of a thin single crystal of Cu has been investigated using 82.4% polarized x rays. The Kronig‐structure energy positions were observed to shift with 30°, 60°, and 90° rotations of the single‐crystal absorber. A similar absorption curve was obtained by using a thin polycrystallinecopper absorber. The five absorption curves are compared and tabulated out to 350 ev from the main K edge. The shifts in energy position of the Kronig structure are discussed in relation to the highly polarized x rays.