Structure in the X-Ray K Absorption Edges of Solid Potassium Chloride

A two crystal vacuum spectrometer was used to investigate the x-ray absorption spectrum of solid potassium chloride over a fifty-volt range in the vicinity of the $K$ edges of both potassium and chlorine. Absorbers were prepared by vacuum evaporation of the salt onto thin, taut Kodapak films. High precision of intensity measurement was made possible by the use of fortuitously located $L{\ensuremath{\alpha}}_{1}$ radiations from targets of antimony and palladium. No corrections to observed intensities were made for the finite resolving power of the instrument. Results are expressed by graphs of relative absorption coefficient as a function of relative photon energy, and are summarized in a table of relative energy separations of prominent absorption maxima and minima.