Laser Raman Spectrometer A certain wavelength of electromagnetic waves acts on the molecules of the substance being studied, causing a transition of the corresponding energy level of the molecule, resulting in a molecular absorption spectrum. The spectrum that causes the transition of the molecular electron level is called the electron absorption spectrum, and its wavelength is in the ultraviolet to visible region, so it is called the ultraviolet-visible spectrum. The transition of the electronic energy level is accompanied by a transition of the vibrational energy level and the rotational energy level. The spectrum that causes the transition of the molecular vibrational level is called the vibrational spectrum, and the transition of the vibrational level is accompanied by the transition of the rotational energy level. The Raman scattering spectrum is the vibration-rotation spectrum of a molecule. When the molecules are irradiated with far-infrared light waves, only the transition of the rotational energy level in the molecule is caused, and a pure rotational spectrum is obtained.
Raman spectroscopy is an analytical method for studying the scattering, the difference between the scattered light and the incident light, and the vibration frequency and rotational frequency of the compound molecules. Similar to infrared spectroscopy, Raman spectroscopy is a vibrational spectroscopy technique. The difference is that the former is related to the dipole moment change of the molecular vibration, while the Raman effect is the result of the change of the molecular polarizability, and the inelastic scattering spoke is measured.
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