Abstract
Thin crystals of KI and RbI with 0.1∼10 µm thickness have been grown from the melt inside the narrow gap of a quartz cell, and their absorption and reflection spectra have been investigated near the fundamental absorption edge at 11 K. In both crystals, when the thickness is decreased to ∼0.5 µm, additional absorption bands are found to appear just below the n =1 and n =2 exciton bands. With further decrease in the thickness, they become intense and shift to lower energy. These additional structures are attributed to the pure triplet exciton states induced by the strains in thin crystals. This assignment is discussed in terms of the exciton model in alkalihalides.
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