![ftir data with essential ftir ftir data with essential ftir](https://cdn.sanity.io/images/0vv8moc6/spectroscopy/fb4940f7f0b3a5ce60f8f49cf8053549a104f850-460x287.jpg)
Raman spectroscopy measures relative frequencies at which a sample scatters radiation, unlike IR spectroscopy which measures absolute frequencies at which a sample absorbs radiation. FTIR spectroscopy is sensitive to hetero-nuclear functional group vibrations and polar bonds, especially OH stretching in water. Raman spectroscopy depends on a change in polarizability of a molecule, whereas IR spectroscopy depends on a change in the dipole moment. Raman and FTIR spectroscopy differ in some key fundamental ways. Using this method, light is absorbed in different amounts in a sample at distinct frequencies which correspond to the vibrational frequencies of the bonds in the sample. Currently, there are six major types of Raman spectroscopy in use today, which are: Spontaneous Raman Spectroscopy, Resonance Raman spectroscopy (RRS), Surface Enhanced Raman spectroscopy (SERS), Coherent Anti-Stokes Raman Scattering (CARS), Stimulated Raman Spectroscopy (SRS) and Spatially Offset Raman Spectroscopy (SORS).įourier transform infrared spectroscopy (FTIR) is a form of vibrational spectroscopy that relies on the absorbance, transmittance or reflectance of infrared light. Raman spectroscopy is an inelastic scattering phenomenon the probes molecular vibrations to provide a molecular fingerprint of materials. Authors & Contributors David Exline October 09, 2013