New Light Emission from the Surface of KI Crystal

抄録

A new emission from the surface of Kl crystal has been found under the irradiation of a N₂ laser light. This emission band is centered at 420 nm and its half width about 0.09 eV. It is observable only in the crystal whose surface has been exposed to air. Since this condition is similar to that found in the formation of V₂ center and the excitation spectrum of this emission band resembles to the absorption spectrum of V₂ center, we propose that V₂ center existing in the crystal surface is responsible for this omission band.