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Electric-field-induced first-order Raman scattering (FIFORS) by the normally Raman inactive LO and TO phonons is observed in the pure alkali halide crystals KCl and KBr under electric fields of 2.5×{}10⁵ V/cm. Cross sections for the FIFORS--active modes are calibrated and the results compared with a theoretical model.
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Krantz et al. (1985) studied this question.
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