Abstract
A new technique was used for the study of the reflectivity on KI, NaI, and KBr in vacuum ultraviolet; the cleavage of the samples was done in liquid helium at 1.8\ifmmode^\circ\else\textdegree\fi{}K, avoiding any pollution of the surface. With this method we observed new structures and, in particular, for the first time the pure triplet exciton state predicted a few years ago by Onodera and Toyozawa.
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