Excess Electron Colour Centres in NaF

概要

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Fine powder of NaF was coloured in an electrodeless discharge. Colour centres were studied by measuring the diffused reflectance. It was possible to obtain a large concentration of F aggregate centres. Besides the well known bands at 342nm and 505nm corresponding to the F and M centres respectively, two additional absorptions peaking at 440nm and 630nm were observed. From bleaching studies they are attributed to excess electron centres. It is shown that thier formation is strongly temperature dependent. The band at 440nm corresponds to the R_2 band. To our knowledge no N band has been reported so far in NaF powder. The band at 630nm is attributed to N centres. An Ivey type relation for the N band peak positions in alkali halides is suggested.
社団法人日本物理学会の論文
1976-12-15