Principle of the hottest Raman spectrometer
2022-10-15- Detail
Principle of Raman spectrometer
when a monochromatic light with a frequency of V0 irradiates the sample, the molecules can scatter the incident light. Most of the light just changes the propagation direction of the light, thus scattering occurs, and the frequency of the transmitted light passing through the molecule is still the same as the frequency of the incident light. At this time, this scattering is called Rayleigh scattering; There is also a kind of scattered light, which accounts for about the total scattered light intensity. The most important and common reason for the sensor failure of the spring fatigue testing machine is the overload of the experimental force 10 ^-6-10 ^-10. The scattered light not only changes the propagation direction, but also changes the frequency of the scattered light, which is different from the frequency of the stimulated light (incident light). Therefore, the scattered light is called Raman scattering. In Raman scattering, if the frequency of scattered light decreases relative to the frequency of incident light, it is called Stokes scattering. A total of 5415 meters of DN500 welded pipe are installed in the project. Therefore, in the opposite case, the scattering with increased frequency is called anti Stokes scattering. Stokes scattering is usually much stronger than anti Stokes scattering. Most Raman spectrometers usually measure Stokes scattering, also collectively referred to as Raman scattering
the frequency difference V between the scattered light and the incident light is called Raman shift. Raman shift is independent of the frequency of the incident light, and it is only related to the structure of the scattered molecule itself. Raman scattering is caused by the change of molecular polarizability n (the change of electron cloud). Raman shift depends on the change of molecular vibration energy level, and the molecular vibration with different chemical bonds or groups has characteristics, Δ E reflects the change of the specified energy level, so the corresponding Raman shift is also characteristic. This is the basis for qualitative analysis of molecular structure by Raman spectroscopy
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