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The photoelectron yield of KrAu sandwiches caused by energy transfer of Kr excitions to the Au substrate is measured. The range for energy transfer of Kr excitons is determined from the dependence of the yield on the thickness of the Kr overlayer for several excitation energies within the n equals; 1, n′ equals; 1, and n equals; 2 exciton bands. The derived diffusion lenghts of free excitons depend strongly on the individual exciton state and increase monotonically with the exciton energy within one exciton band as well as to higher exciton states from 30 Å for the n equals; 1 up to 300 Å for the n equals; 2 excitons. The efficiency for electron emission due to exciton decay exceeds the usual photoelectron yield of Au by a factor of ten.
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Schwentner et al. (1981) studied this question.
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