Abstract
A study of both thick-crystal and thin-film optical absorption data for the thallous halides (CsC1 crystal structure) indicates a direct band gap associated with the excitation of the thallous rather than the halide ions. Extremely narrow and very strong exciton lines exhibiting sidebands have been observed in thin films which are relatively free of strain. A very small exciton binding energy, a high polarizability, and large electron-lattice interaction favor this sideband structure which is probably due to coupled exciton-phonon states.
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