Raman microscope

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Overview

The Confocal 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 different wavelengths which is then read with a CCD camera. Raman is based inelastic scattering due to characteristic vibrational modes of the material being studied.

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.

External links

• wikipedia:Raman spectroscopy