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Raman Scattering by Optical Phonons
Dispersion of Polar Optical Modes in Cubic Diatomic Crystals
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According Additional allowed angle appears approximation associated becomes branches calculated cause Claus coefficients components constant coordinates corresponding coupled crystals cubic crystals damping denotes depend derived described detail determined dielectric dipole directions discussed dispersion dispersion branches displacement easily electric field electronic elements energy equations exciting experimental experiments extraordinary factor finally frequency function given hand identical incident indicated intensity introduced laser lattice Letters light scattering limiting linear lines longitudinal macroscopic magnitude material matrix medium Merten modes normal observed obtained operator optic optic axis ordinary phonons Phys plane polar polaritons principal purely radiation Raman effect Raman scattering referred refractive region relation respectively result rules shown Space Groups species spectra stimulated Stokes surface symmetry Table taking tensor theory tion transverse uniaxial crystals vector vibrations wave wave-vector written