Raman effect
2022-11-06 07:20:07
Raman scattering, also known as Raman scattering, was discovered by Indian physicist Raman in 1928. It refers to the phenomenon that the frequency of light waves changes after being scattered. In 1930, the Nobel Prize in Physics was awarded to Sir Chandrasekhara Venkata Raman (1888-1970) of the University of Calcutta, India, for his research on light scattering and discovery of the law named after him.
an introduction to:
In 1930, the Nobel Prize in Physics was awarded to Sir Chandrasekhara Venkata Raman (1888-1970) of the University of Calcutta, India, for his research on light scattering and discovery of the law named after him.
There is a special effect in the light scattering phenomenon. Similar to the Compton effect of X-ray scattering, the frequency of light will change after scattering. "Raman scattering" means that when a laser of a certain frequency shines on the surface of the sample, molecules in the material absorb part of the energy, vibrate in different ways and degrees (for example, the swing and twist of atoms, the swing and vibration of chemical bonds), and then scatter light of a lower frequency. The change of frequency depends on the characteristics of the scattering material. Different atomic groups have unique vibration modes. Therefore, the scattering light with specific frequency can be generated. The spectrum is called "fingerprint spectrum", which can be used to identify the types of molecules that make up the material. This was discovered by Raman in 1928 when he studied the scattering process of light. A few months after Raman and his collaborators announced the discovery of this effect, G. Landsberg and L. Mandelstam of the Soviet Union also independently discovered this effect, which they called joint scattering. Raman spectroscopy is the result of superposition of molecular vibration energy or rotation energy and photon energy when incident photons collide with molecules. Raman spectroscopy can be used to transfer the molecular energy spectrum in the infrared region to the visible light region for observation. Therefore, Raman spectroscopy, as a supplement to infrared spectroscopy, is a powerful weapon for studying molecular structure.
an introduction to:
In 1930, the Nobel Prize in Physics was awarded to Sir Chandrasekhara Venkata Raman (1888-1970) of the University of Calcutta, India, for his research on light scattering and discovery of the law named after him.
There is a special effect in the light scattering phenomenon. Similar to the Compton effect of X-ray scattering, the frequency of light will change after scattering. "Raman scattering" means that when a laser of a certain frequency shines on the surface of the sample, molecules in the material absorb part of the energy, vibrate in different ways and degrees (for example, the swing and twist of atoms, the swing and vibration of chemical bonds), and then scatter light of a lower frequency. The change of frequency depends on the characteristics of the scattering material. Different atomic groups have unique vibration modes. Therefore, the scattering light with specific frequency can be generated. The spectrum is called "fingerprint spectrum", which can be used to identify the types of molecules that make up the material. This was discovered by Raman in 1928 when he studied the scattering process of light. A few months after Raman and his collaborators announced the discovery of this effect, G. Landsberg and L. Mandelstam of the Soviet Union also independently discovered this effect, which they called joint scattering. Raman spectroscopy is the result of superposition of molecular vibration energy or rotation energy and photon energy when incident photons collide with molecules. Raman spectroscopy can be used to transfer the molecular energy spectrum in the infrared region to the visible light region for observation. Therefore, Raman spectroscopy, as a supplement to infrared spectroscopy, is a powerful weapon for studying molecular structure.
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