Abstract
AbstractThe emission and transmission spectra of extremely thin high‐quality CdS single crystals are investigated from 1.8 to 77 °K. At low temperatures using stationary excitation by a high‐pressure mercury lamp an emission spectrum with a pronounced peak 3.2 meV below the energy of the A‐exciton is observed, which is characteristic of all thin crystals investigated. The experimental facts, including kinetic phenomena, suggest an explanation of the emission in terms of a system of interacting excitonic molecules. The molecule binding energy is found to be 3.2 meV.
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