What is the working principle of Brook Raman spectrometer?

Raman spectrometer produces that when laser irradiates the sample surface, most of its scattered light is Rayleigh scattered light, but there are a small amount of Stokes scattered light with various wavelengths and a small amount of anti-Stokes scattered light with various wavelengths. The latter two are called Raman scattering. These scatter light are collected by an optical system external to that sample, such as a mirror. ...

Qualitative analysis shows that Raman shift has nothing to do with the frequency of excitation light, but only corresponds to the rotational and vibrational energy levels of molecules. Theoretical and experimental results show that different molecules or different molecular structures have different optical rotations ... Because Raman intensity is related to the number of molecules in the ground state, it can be quantitatively analyzed by Raman intensity under the condition of internal standard. ...

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