Abstract
ON Jauncey's theory (Phys. Rev., 25; 314; 1925) of the unmodified line in the Compton effect, an unmodified X-ray is scattered when the energy of the impulse imparted to an electron is insufficient to eject the electron from the parent atom. In this case the impulse is presumably imparted to the atom itself. The change of wave-length of the unmodified ray should thus be of the order of [(mass of the electron)/(mass of the atom)] × (change of wave-length of the modified line). It is generally assumed that no coherence occurs for modified scattering on account of the change of wave-length. In the case of unmodified scattering, however, it is assumed that coherence does occur, as, for example, in regular crystal reflection (see papers by Williams, Phil. Mag., 2, 657; 1926; and Jauncey, Phys. Rev., 29, 757; 1927). But how can coherence occur in unmodified scattering if there is a change of wave-length, however small? Perhaps there is no change of wave-length at all in unmodified scattering.
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JAUNCEY, G., COMPTON, A. Coherence of the Reflected X-Rays from Crystals. Nature 120, 549 (1927). https://doi.org/10.1038/120549a0
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DOI: https://doi.org/10.1038/120549a0
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