Reflectance spectra and thermoluminescence of NaF coloured in an electrodeless discharge

A comparative study of γ-ray colouration and electrodeless discharge excitation is reported for NaF. New absorption bands and glow peaks were found. There are shown to be characteristic of electrodeless discharge method of colouration. These are attributed to the multiple types of defects. Further, it is shown that the process by which such defects are formed is strongly temperature dependent. A tentative explanation for the peculiar characteristic of the electrodeless discharge excitation is put forth. The possibility of exploiting these peculiarities for the study of certain properties of colour centres is pointed out. (author)