Temperature dependence of multiphonon absorption in zinc selenide

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Abstract
Bulk and surface absorption coefficients of zinc selenide have been measured by 10.6-μm laser calorimetry at temperatures between 20 °C and 300 °C. The surface absorption characteristic shows evidence of the disappearance of an absorbing species at temperatures above 120 °C and the thermal activation of a second species above 200 °C with an activation energy near 0.13 eV. The bulk characteristic shows a monotonic increase with temperature that is consistent in its general form with the predictions of multiphonon theory, but with systematic deviations. These deviations are explained by the combination of a temperature independent extrinsic absorption and a well defined peak near 960 cm−1 in the room temperature absorption spectrum.