Direct lattice absorption associated with shallow impurity levels

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Abstract
An attempt is made to show how the failure of the adiabatic approximation for shallow impurity levels may lead to single-phonon absorption by the host lattice in materials with diamond structure. This will be most marked for the optical modes which are densely distributed over a small frequency range. An estimate of the integrated absorption for semi-conducting diamonds (type IIb) indicates that single-phonon absorption should be observable. The implications of the theory for doped germanium and silicon are also briefly considered.

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