Abstract:Pure andimpurity-doped NaCl crystals are irradiated with 28 MeV cr-particles at room temperature. The beam current is 2 nA and the irradiation is continued for one minute in each case. Due to irradiation, F-centers are produoed uniformly in the crystals. The beam divergence is estimated from the observed area of the colored circular spot on the crystal. The optical absorption band of the colored samples are recorded. The efficiency of coloration (F-center) is determined and is found to be independent of orient… Show more
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