Raman spectrometer is mainly applicable for scientific research institutions,
institutions of higher learning in physical and chemical
laboratory, biological and medical field optics, in the composition
of matter determination and confirmation; can also be used in
criminal investigation and jewelry industry of drug detection and
gemstone identification. The apparatus is known for its simple
structure, easy operation, fast measurement and high accuracy, and
can be used to obtain a higher resolution, and can be used to
measure the UM level of the sample surface.
When a beam of monochromatic light is irradiated to a sample of V0,
the molecules can cause the incident light to scatter. Most of the
light is only to change the direction of light propagation, and the
frequency of the transmitted light is still the same as that of the
incident light, which is called Rayleigh scattering; and a
scattering light, which is about 10^~10^ of the total scattered
In Raman scattering, the scattering light frequency is reduced by
the incident light frequency, which is referred to as Stokes
scattering. Therefore, the scattering of the frequency increases,
which is called the inverse Stokes scattering, and Stokes
scattering is usually stronger than the anti Stokes scattering.
The frequency difference between the scattered light and the
incident light is called V, which is not related to the incident
light frequency, which is related to the structure of the
scattering molecule itself. Raman scattering is due to the changes
in the molecular polarity of the (electron cloud).
Raman shift is decided to changes in molecular vibration energy
level, different chemical bond or a group of molecular vibration,
delta e reflects the specified level changes, so with the
corresponding Raman shift is characteristic. This is the basis for
the qualitative analysis of molecular structures.