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" ... RR spectroscopy involves shining a laser onto a sample and measuring the bond vibrations within molecules in the sample by an inelastic scattering process where an absorbed photon is reemitted at either a lower or higher energy. The difference in energy between the absorbed and reemitted photons corresponds to the energy of a molecular vibrational mode (i.e.; stretching of all carbons connected by double bonds), and the wavelength of reemitted photons is detected and used to study the structure of the molecule. ... "