Abstract
The absorption spectra have been measured on thin RbI crystals at 11 K. When the crystal thickness decreases below 0.5 µm, new absorption peaks are found to appear on the low-energy side of the n =1 and n =2 exciton bands. From measurements of the thickness dependence, these additional structures are interpreted as being due to the pure triplet exciton states induced by the strains in thin crystals.
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