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.
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References
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LONSDALE, K., SMITH, H. Quantum Theory and Diffuse X-Ray Reflexions. Nature 149, 404–405 (1942). https://doi.org/10.1038/149404a0
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DOI: https://doi.org/10.1038/149404a0
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