Heller et. al. discovered “transition sliding” when applying this technique to graphene, which is unusually explained by a fourth-order “double resonance” model instead of KHD theory. Calcium fluoride is used as a substrate in a form of confocal microscopy that relies on this technique. George Placzek developed an approximation in this technique that compares the depolarization ratio of a mode to 0.75 to determine its symmetry. A (*) notch filter is used to increase the resolution of this technique. Molecules are adsorbed onto nanostructured gold or silver to enhance their signals in one form of this (-5[1])technique. Molecules with a center of symmetry cannot have modes active in both infrared spectroscopy and this (10[1])technique. For 10 points, give this technique that measures Stokes and anti-Stokes shifts caused by inelastic scattering of photons and is named after an Indian physicist. ■END■ (10[2])