The classical model of a solid treats the atoms and moleculesas oscillating electric dipoles with characteristic resonant frequencies.The resonances due to the bound electrons occur in the nearinfrared, visible, and ultraviolet spectral regions (1014–1015 Hz),while those associated with vibrations occur in the infrared (1012–1013 Hz). Free electrons can be treated in the dipole oscillatormodel by assuming that the natural resonant frequency is zero.
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