Kneipp, Katrin Wellman Center for Photomedicine, Harvard-MIT Division of Health Sciences and Technology, Boston, Massachusetts.
Feld, Michael S. G. R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts.
- Physical principles
- Raman spectroscopy
- Incoherent Raman scattering
- Coherent Raman scattering
- Links to Primary Literature
- Additional Readings
A phenomenon observed in the scattering of light as it interacts with a material medium in which the incident light suffers a change in frequency due to internal energy change of the molecular scatterers. Raman scattering differs in this respect from Rayleigh scattering in which the incident and scattered light have the same frequency. Shifts in frequency are determined by the type of molecules in the scattering medium, and spectral analysis of the scattered light can provide a “fingerprint” of the chemical structure of the scatterers. Both incoherent and coherent forms of the Raman effect exist. Spontaneous Raman scattering, the usual (incoherent) form, is very weak, with Raman signals 4–5 orders of magnitude smaller than Rayleigh scattering and about 14 orders of magnitude smaller than fluorescence. In stimulated Raman scattering, a coherent form, the signals may be quite large. In addition, there are nonlinear forms of Raman scattering, including hyper-Raman scattering and coherent anti-Stokes Raman scattering (CARS). See also: Scattering of electromagnetic radiation
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 42 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information