Abstract
A discussion of an experimental procedure for determining the absorption spectra of low temperature solids by thermo-optical spectroscopy is presented. The method may be extended to the direct measurement in low temperature solids of radiationless relaxation dynamics. The development of a suitable detector utilizing thin films of semiconducting germanium in an amorphous state is discussed. Performance data for the detector are presented and the results of some measurements on crystalline samples of biacetyl and several inorganic semiconductors are illustrated and briefly discussed.
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