Abstract
New emission bands have been observed at 450 nm and 341 nm when a crystal of KI doped heavily with Tl+ was excited with ultraviolet light near 285 nm at 5 K. An absorption band has been found at 284.5 nm from the excitation spectrum. Dependence of the emission intensity on the concentration of Tl+ shows that this luminescence is due to (Tl+)2 centers.