Raman microscope
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Overview
The Raman microscope is an optical microscope through which an monochromatic laser source is directed at a sample. The sample absorbs energy and scatters the light at a different wavelength which is then read with a CCD camera.
File:Raman energy levels.svg
Energy level diagram showing the states involved in Raman signal. The line thickness is roughly proportional to the signal strength from the different transitions.
Significance
Micro Raman spectroscopy is a useful technique for determining the number of layers of small samples of graphene.