Abstract
A lot of narrow lines on R2, R+, N1, N- and some other unknown centers have been observed in γ-rayed pure and doped sodium fluoride crystals in the temperature range of 9-77 K. The proper laser irradiation was used for strengthening the zero-phonon lines and the relative explanation was given. The spectral properties and thermostabilities of the lines were investigated systematically at different temperatures.
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