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Ra'man effect"

Pronunciation: (rä'mun), [key] Optics.
the change in wavelength of light scattered while passing through a transparent medium, the collection of new wavelengths (Ra'man spec"trum) being characteristic of the scattering medium and differing from the fluorescent spectrum in being much less intense and in being unrelated to an absorption band of the medium.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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