Raman effect



While studying the scattering of light Raman found that when a beam of monochromatic light was passed through organic liquids such as benzene,toluene etc.,the scattered light contained other frequencies in addition to that of the incident light.This is known as Raman effect discovered by raman. The original arrangement used by Raman was simple in design.A round bottomed glass flask was filled with pure dust free benzene.The liquid was strongly illuminated by the mercury blue line.The scattered light was examined through spectroscope in a direction perpendicular to that of the incident light.It was observed that the spectrum contained in addition to the original wave length,some lines which had wavelengths longer as well as shorter than the original wavelength.These lines of modified wavelengths greater than that of the incident wavelength are called anti stokes lines.The stoke lines are found to be more intense than the anti stokes lines.Most of the Raman lines are strongly polarized. The original arrangement used by Raman was simple in design.A round bottomed glass flask was filled with pure dust free benzene.The liquid was strongly illuminated by the mercury blue line.The scattered light was examined through spectroscope in a direction perpendicular to that of the incident light.It was observed that the spectrum contained in addition to the original wave length,some lines which had wavelengths longer as well as shorter than the original wavelength.These lines of modified wavelengths greater than that of the incident wavelength are called anti stokes lines.The stoke lines are found to be more intense than the anti stokes lines.Most of the Raman lines are strongly polarized.