Abstract
Duane's quantum theory of diffraction is applied to the reflexion of electrons by crystals and to the spatial distribution of photoelectrons and fluorescent radiation from a crystal.Two alternative criteria for coherence are given. According to the second of these there is coherence provided that the momentum imparted to the components of a system during the process concerned is insufficient, owing to quantum restrictions to their motion, to change their energy. Calculations made on this supposition show that in the case of the scattering of radiation by a crystal there is complete coherence for the lower orders, while for higher orders this ceases to be the case and the reflected intensity is reduced as the result of incoherent scattering. The specular reflexion by gases is also considered.Duane's theory of diffraction has not been placed on a rigorous basis and the solutions which have been proposed here for various problems may be incorrect. Even so the theory has at least served to bring to light several points of theoretical and experimental interest which deserve consideration.
Publisher
Cambridge University Press (CUP)
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4. A similar result applies to the reflexion of electrons by crystals. Since the mass of a crystal is large compared with the mass of an electron it follows that reflected electrons lose very little energy when they are reflected and as far as loss of energy due to reflexion is concerned reflected electrons must be ‘full-speed’ electrons.
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2 articles.
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