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Raman spectroscopy is a non-destructive and non-invasive method that can be used to assess the physical characteristics of materials, examine chemical bonding, and identify molecules. It resolves most of limitations of other spectroscopic techniques. It is also defining technique which offers chemical and structural information.
Raman Spectroscopy is a vibrational spectroscopic technique that uses the wavelength shift of light scattered (Raman shift) from molecules in a sample, to characterize them. When light of known wavelength is inelastically scattered by matter, the wavelength shift (or frequency shift) of the scattered photons is different from the incident photons. The shift is related to the molecular vibrations, which are unique to each molecular structure. The change in frequency of scattered photons may be positive or negative. Raman spectroscopy involves detecting and recording these wavelength shifts and using them to analyze what is in the sample. A Raman spectrum will have several peaks, each peak corresponding to a specific mode of molecular vibration of a chemical species. The position of the peaks is used for species identification, while its intensity indicates species concentration. Several variations of the basic technique exist, such as Resonance Raman, Spontaneous Raman, Fourier Transform Raman, Surface Enhanced Raman Spectroscopy, and nonlinear coherent Raman techniques, such as hyper Raman spectroscopy. The types of materials to which Raman Spectroscopy can be applied is wide ranging, including dissolved organic and inorganic molecules, crystalline solids, ceramics, glasses, nanostructure materials and microorganisms. In the case of gases, the concentration of molecules in a gas is typically very low, so special measurement techniques to enhance the signals are needed.
Video
Common Uses of Raman Spectrometry (Raman)
Advantages of Raman Spectrometry (Raman)
Limitations of Raman Spectrometry (Raman)
Industrial Applications of Raman Spectrometry (Raman)
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ASTM E572 test method covers the analysis of stainless and alloy steels by Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF). It provides rapid, multi-element determinations with sufficient accuracy to assure product quality.
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