What is Raman Effect?
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Some part of light beam after passing through a transparent medium gets scattered.
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This phenomenon of scattering of light is termed as Raman Scattering and the cause of scattering is called the Raman Effect.
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The wavelength of these scattered rays is different from that of the incident rays of light.
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This phenomenon was explained/discovered by Indian physicist Chandrasekhara Venkata Raman (CV Raman) on February 28, 1928.
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This discovery was awarded with the Nobel Prize in Physics in 1930.
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Feb 28 is observed as National Science Day in India.
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In the Raman effect, when light is scattered off an object, say a molecule, two bands are observed, with higher and lower frequency than the original light, called the Stokes and anti-Stokes bands, respectively.
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By studying the relative intensity of the two bands, it is possible to estimate the temperature of the object which scatters the light. This principle is used in Raman Thermometry.