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3 minutes to take you to understand the working principle of portable Raman spectrometer
Release time:
2023-07-24 14:44
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portable Raman spectrometer is famous for its simple structure, simple operation, fast and accurate measurement, and low wave number measurement ability; it adopts confocal optical path design to obtain higher resolution. The sample surface can be used for micro-area detection at the micron level, and can also be used for microscopic image measurement. The instrument became a small, mobile laboratory.
The working principle of the portable Raman spectrometer:
When monochromatic light with a frequency of v0 is irradiated on the sample, the molecules can scatter the incident light. Most of the light just changes direction and scatters, while the frequency of the light is still the same as the frequency of the excitation light. This scattering is called Rayleigh scattering; scattering accounts for 10-6 to 10-10 of the total scattered light intensity, which not only changes the direction of light propagation, but also changes the frequency of the scattered light, which is different from the frequency of the excitation light, called Raman scattering. In Raman scattering, the frequency decreasing scattering is called Stokes scattering, and the frequency increasing scattering is called anti-Stokes scattering. Stokes scattering is generally much stronger than anti-Stokes scattering. Raman spectrometers typically measure Stokes scattering, also known as Raman scattering.
The frequency difference v between the scattered light and the incident light is called the Raman shift. The Raman shift is independent of the incident light frequency, but only related to the structure of the scattering molecule itself. Raman scattering is caused by the change of molecular polarizability. The Raman shift depends on the change of molecular vibration energy and molecular vibration with different chemical bonds or groups, ΔE reflects the change of specific energy level, so the corresponding Raman shift is also characteristic. This is the basis for qualitative analysis of molecular structure by Raman spectroscopy.
The working principle of the portable Raman spectrometer:
When monochromatic light with a frequency of v0 is irradiated on the sample, the molecules can scatter the incident light. Most of the light just changes direction and scatters, while the frequency of the light is still the same as the frequency of the excitation light. This scattering is called Rayleigh scattering; scattering accounts for 10-6 to 10-10 of the total scattered light intensity, which not only changes the direction of light propagation, but also changes the frequency of the scattered light, which is different from the frequency of the excitation light, called Raman scattering. In Raman scattering, the frequency decreasing scattering is called Stokes scattering, and the frequency increasing scattering is called anti-Stokes scattering. Stokes scattering is generally much stronger than anti-Stokes scattering. Raman spectrometers typically measure Stokes scattering, also known as Raman scattering.
The frequency difference v between the scattered light and the incident light is called the Raman shift. The Raman shift is independent of the incident light frequency, but only related to the structure of the scattering molecule itself. Raman scattering is caused by the change of molecular polarizability. The Raman shift depends on the change of molecular vibration energy and molecular vibration with different chemical bonds or groups, ΔE reflects the change of specific energy level, so the corresponding Raman shift is also characteristic. This is the basis for qualitative analysis of molecular structure by Raman spectroscopy.
Portable Raman spectrometer
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