X-Ray Isochromat of Cu near CuK-Edge

Abstract

Isochromats of copper were investigated at the wavelengths corresponding to characteristic CuKα₁ and Kα₂ lines, and also at wavelengths of the continuous radiations near the CuK absorption edge. Apparatus used consisted of an ultra-high-vacuum X-ray tube, a curved quartz crystal spectrometer and a GM counter.
Results are as follows; at the characteristic Kα₁ and Kα₂ wavelengths the observed isochromats show the same threshold voltage as well as similar structures with some difference in their intensity. For the continuous radiations, four curves observed at different wavelengths within 15 volts around the edge agree in structure. Hence, it is inferred that the presence of a K-hole does not lead to an essential difference in the feature of isochromat. The differences observed in the intensity may be interpreted in terms of the electron population and the self-absorption of X rays within the target.