Fluorescence increasing effects in electron and proton irradiated BaF/sub 2/:Sr crystals

Summary form only given. In this paper, we summarize theoretical data on optical properties (absorption/luminescence) and fluorescence increasing effects of BaF/sub 2/:Sr crystals irradiated by fast electrons and protons. Measurements of the emission spectra showed that fluorescence increasing effects responded in both cases. A strong luminescence with a broad spectral range from 300 to 500 nm and its peak value at 353 nm presented in electron irradiated BaF/sub 2/:Sr crystals, and the luminescence after electron irradiation were about ten times more intense than that before irradiation, and the similar effect appeared in proton irradiated specimen as well, but with a strong sharp peak at 346 nm. We analyze results of energy state calculations by discrete variation means (HFS-DVM-X/sub a/) for Ba/sup +/, Sr/sup +/, Sr/sup 2+/ ions and irradiation-induced interstitial Sr/sup 2+/ ions in BaF/sub 2/:Sr crystals. It is shown that the emission band of electron irradiated samples comes from the overlapping of Ba/sup +/, Sr/sup +/ ions and BaF/sub 2/ intrinsic emission, and the sharp peak of proton irradiated specimen is the fluorescence emission of interstitial Sr/sup 2+/ ions, and the mechanisms of the fluorescence increasing effects were valence state or position changes of Ba and Sr ions in BaF/sub 2/:Sr crystals during electron or proton bombardments.