On crystal and slit systems for X-ray monochromatization and spectroscopy

Abstract

Crystal and slit systems are used for four purposes in X-ray physics: (i) analysis of crystal structure; (ii) wave-length determinations; (iii) spectroscopic analysis of composite radiations; and (iv) the production of monochromatic beams. The theory of (i) and (ii) has been discussed by many authors; but hitherto the theory of (iii) and (iv) has received but little attention, through Richtmyer has pointed out that serious errors may arise from a neglect of the proper consideration of (iv). In this paper a systematic theory of could hardly have been anticipated on general grounds. Furthermore, an application of the theory to the design of monochromators leads to notable departures from the conventional pattern.