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In compound semiconductors, the bonding between atoms of different species forms a set of dipoles. These dipoles can absorb energy from an electromagnetic field, achieving a maximum coupling to the radiation when the frequency of the radiation equals a vibrational mode of the dipole. When this
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of the incident radiation becomes smaller than the work required to eject an electron from one or other
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just below the binding energy of the K-shell electron in that atom cannot eject the K-shell electron.
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happens, the absorption coefficient gets a peak yielding the
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This occurs in the far infrared region of the spectrum.
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