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Energy-level diagram showing the states involved in Raman spectra. Raman spectroscopy (/ ˈ r ɑː m ən /) (named after physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. [1]
The spectrum of the Raman-scattered light depends on the molecular constituents present and their state, allowing the spectrum to be used for material identification and analysis. Raman spectroscopy is used to analyze a wide range of materials, including gases, liquids, and solids.
Simulated vibration-rotation line spectrum of carbon monoxide, 12 C 16 O. The P-branch is to the left of the gap near 2140 cm −1, the R-branch on the right. [note 2] Schematic ro-vibrational energy level diagram for a linear molecule. Diatomic molecules with the general formula AB have one normal mode of vibration involving stretching of the ...
Raman amplification / ˈ r ɑː m ən / [1] is based on the stimulated Raman scattering (SRS) phenomenon, when a lower frequency 'signal' photon induces the inelastic scattering of a higher-frequency 'pump' photon in an optical medium in the nonlinear regime. As a result of this, another 'signal' photon is produced, with the surplus energy ...
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Raman microscopy, and in particular confocal microscopy, can reach down to sub-micrometer lateral spatial resolution. [7] Because a Raman microscope is a diffraction-limited system, its spatial resolution depends on the wavelength of light and the numerical aperture of the focusing element. In confocal Raman microscopy, the diameter of the ...