Abstract
A CHANGE of frequency in the scattering of light or of X-rays is a familiar phenomenon. On the other hand, the coherent X-ray reflections given by crystals are a consequence of classical optics and any change of frequency in such reflection might seem inadmissible. A closer consideration shows, however, that even on the classical theory, a change of frequency might accompany a coherent reflection, if the structure-amplitude of the crystal planes responsible for the reflection were to vary periodically with time. This would occur, for example, when the interpenetrating lattices in the crystal oscillate against each other with the characteristic infra-red frequencies and produce pulsations of the electron-density in the crystal. On the principles of the quantum theory, therefore, such lattice oscillations, though initially non-existent, may be excited as the result of the incident radiation and give rise to a coherent reflection of altered frequency.
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RAMAN, C., NILAKANTAN, P. Reflection of X-rays with a Change of Frequency. Nature 145, 860 (1940). https://doi.org/10.1038/145860a0
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DOI: https://doi.org/10.1038/145860a0
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