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Raman Spectrometry

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When a photon of a monochromatic laser beam strike/interacts with a molecule then the photon is mainly scattered elastically and we have the so-called elastic Rayleigh scattering. During this interaction there is a low probability of the photon energy to cause vibrational excitation or even rarely vibrational relaxation of the molecule and the photon is thus scattered with respectively lower or higher energy. This process is called Inelastic Raman Scattering effect and these vibrational transitions are characteristic for each molecule. The Raman Scattering is quite weak phenomenon and Raman spectroscopy was considered as an awkward technique especially when it should have to be applied to simple everyday problems that required speed, straightforward results and clarity, although it is an almost no sample preparation technique. However, new Raman instrumentation based on new concepts of monochromator designs, laser technology, CCD cameras, fiber optics application as well as backscattering collection geometry through microscope objectives rendered Raman spectroscopy as one of the most powerful techniques for material characterization. The application of Raman spectroscopy was further expanded by the construction of Raman micro-probes that have been successfully applied to a wide range of analyses to identify contaminants, inhomogeneities and properties of materials and structures encountered in industrial production even in hazardous and not-friendly environments.

 

Services Sample properties
  • Structure identification of variety of materials in all states of matter
  • Molecular orientation in polymers
  • Degree of polymer crystallinity
  • Quantitative measurements, Thermodynamic functions evaluation
  • Single crystal analysis
  • Molten salts, oxide melts, corrosive melts
  • Low-frequency studies
  • Films
  • Surface mapping
  • Identification of nanotubes
  • Biological samples
Raman spectroscopy is a non-destructive technique, which needs only a small portion of a sample to identify its chemical structure. A variety of samples such as solids, liquids, gases, glasses, fibers can be measured in a wide temperature range

 

 

 

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Contact Persons:
G. Voyiatzis
J. Parthenios

 

 
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