Abstract
It is shown for the first time that the recently developed calorimetric absorption spectroscopy (CAS) is most fruitfully applicable as a direct measure of nonradiative decay of excitonic systems even concerning their fine structure properties if experiments are performed in the mK range achieved in a 3He/4He-dilution refrigerator. CAS gives hints on different scattering and relaxation processes of longitudinal AL and triplet AF excitons in CdS, and directly evidences nonradiative decay ratios of different bound-exciton complexes. Even TA-phonon-assisted recombination of such systems leads to well measurable CAS signal enhancement.
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