An attempt was made to reveal the modified VK centers in low-temperature ultraviolet-irradiated Cl-doped crystals. The results appeared to favor a new type of VK center which was localized near to an impurity halogen, instead of a heteronuclear VK center.

Impurity-Vk Center Associations in KI Crystals Containing Lighter Halogens. L.Matei, T.Serban, M.Secu, T.Beica: Journal of Luminescence, 1997, 72-74, 691-2