Piezoreflectance of Potassium Iodide in the Vacuum Ultraviolet Region from 5 to 30 eV

Piezoreflectance spectra of potassium iodide were measured from 5 to 30 eV in the fundamental and core excitation region. The deformation potentials cubic, tetragonal and trigonal, were deduced for twenty six structures observed in this energy region and are analyzed in terms of a simple point ion model to identify the electronic origins of these structures.