Abstract
Creation of Ag − and Ag 0 centers by irradiation with ionizing radiations has been investigated using NaCl and KCl crystals containing various concentrations of Ag + ions and using Ca 2+-codoped NaCl:Ag + and KCl:Ag + crystals. From the absorption spectra, it is observed that Ag − center perturbed by Ca 2+ ion is also created besides the Ag − and Ag 0 centers. It is confirmed that Ag − and Ag 0 centers increase with increasing the concentration of doped Ag + ions. It is suggested that there are two kinds of Ag 0 cv a centers (i.e. Ag 0 accompanied by vacancy at the nearest neighbor) with different site symmetries depending on the location of vacancy.
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