| Summary: | The Rayleigh scattering of light, in which light is scattered with the same frequency as that of the incident beam, has been known for many years, and explained theoretically in terms of the polarizability of the molecules which make up the scattering media. The type of scattering known as the Raman effect, where the frequency of the incident light is altered in the scattered radiation, is of more recent discovery; its theoretical basis is very similar, but depends upon the changes of polarizability of the scattering molecules which occur with vibration and rotation. The attempt to explain and predict the intensities and depolarization factors of lines in a Raman spectrum must, therefore, consider in detail the theories of the origin within a molecule of its polarizability. Part I of this work is concerned with a modification of one of these theories, in Part II its results are applied to give predictions of the characteristics of some Raman lines.
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