Annealing and re-irradiation behaviour of the F band in lithium fluoride between 80 $deg$K and 300 $deg$K

Publisher Website
Google Scholar
Abstract
Lithium fluoride samples from two different sources have been irradiated at 81 °K and then warmed to room temperature. Three annealing stages of the F band were found in this temperature range. Stages I and III (at about 120 °K and 250 °K respectively) have also been found by previous authors, whereas stage II (at about 180 °K) has not been reported before. The samples were also warmed to several temperatures between 81 °K and room temperature after irradiation, then recooled to 81 °K and re-irradiated. Both the annealing behaviour and the re-irradiation behaviour of the F band were found to be markedly sample dependent. An optical absorption band which has not been previously reported was found after irradiation at 81 °K. This band, which has its peak at 415 nm, anneals at about 100 °K.