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Absorption diagnostics of quantum size effect on the excited states of SbI3 clusters in FAU zeolite

We report the absorption spectra (at 10 K) for SbI3 clusters with molecular numbers 1/2, 1 and 2 which were created in FAU-zeolite cages. At 2.0 - 3.7 eV there appear bands whose energies strongly depends of the loading densities of SbI3 molecules. These energies are remarkable blue shifted compared with the one of the bulk exciton (2.615 eV). This shift is interpreted in terms of the quantum size effect. The observed blue-shift of absorption bands coincides with one calculated in mh/me>>1 approximation (typical for MI3 layered crystals).