Quantum Theory and Diffuse X-Ray Reflexions

Abstract

Prof. Born and Miss Sarginson¹ have pointed out that according to the quantum mechanical calculations of Ott (1935) and also from the point of view of Placzek's quasi-classical theory, the excitation by the X-ray energy of characteristic crystal vibrations (analogous to the Raman effect in light scattering) would only be expected to give X-ray interference effects entirely secondary in importance to those of the thermal vibrations. Ott² suggested, however, that in regions where a Bragg reflexion would normally be forbidden, the Raman effect might possibly give an observable reflexion, and questioned whether the 222 reflexion from diamond might not be such an instance.