Abstract
A survey has been made of color centers produced in NaF crystals by X-irradiation. Measured at 80°K, the F-band occurs at 333 mμ (3.72 eV), the M-band at 498 mμ (2.49 eV). At room temperature the comparative wavelengths are 341 mμ and 505 mμ, respectively. The R 1− and R 2−bands and the K-band occur at 395 mμ (3.14eV) 435 mμ (2.85 eV), and 282 mμ (4.40 eV), respectively, measured at 80°K. Four V-type bands are observed at liquid N 2 temperature at 288 mμ (4.31 eV), 267 mμ (4.64 eV), 249 mμ (4.98 eV) and 233 mμ (5.32 eV). These disappear upon warming to room temperature. Study of growth kinetics at four temperatures indicates that X-irradiation at CO 2 temperatures is an efficient means of production of high concentrations of F-centers with only minor formation of M-centers. At room temperature and 100°C, X-irradiation produces M-centers at concentrations proportional to the square of the F-center concentration.
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