An X-Ray Absorption Band

Abstract

FOR some time past I have been trying to make accurate comparisons of the intensities of the various orders of X-ray spectra reflected by crystals. The purpose of the inquiry is to make experimental tests of the theoretical discussions by Debye and Sommerfeld in relation to the influence of molecular motions upon reflecting power. Of some of their predictions I have found it easy to obtain confirmation which is at least roughly quantitative. For instance, the intensities of the higher order spectra are much more affected by rise of temperature than the lower, and the amount of the change is of the right order of magnitude; also rock salt and sylvine show greater changes than fluorspar.