The creation of F centers in lithium fluoride between 77° and 600°K and their interpretation by a recombination model of interstitial-vacancies

Color center creation in LiF crystals irradiated with 5- and 10-MeV Au ions

“…Let us note, that in the case of X-ray irradiation the accumulation of F centers follows N F $ ffiffiffiffiffi ut p i.e. no flux dependence was observed [17].…”

“…Due to the very high mobility of H centers at room temperature [1][2] we can assume that the concentration of single H centers reaches a steady state value [17]. Therefore, dN H =dt ¼ 0 in Eq.…”

“…(6) clearly shows the deviation of the reciprocity law between the intensity and duration of irradiation [17][18], because flux and time appear as dissimilar functions. At a given fluence U ¼ u t, the F center concentration follows a N F $ u 1=3 dependence.…”

“…2(b)) can be explained by taking into account the kinetic of F and H center evolution (see [12][13][14][15][16][17]). At room temperature irradiation the recombination of F-H centers is predominantly determined by the high mobility of H centers [2][3][4].…”

F centers in LiF: A nuclear magnetic resonance study

“…As these studies have shown, the F center EPR spectra show orientation dependent hyperfine splittings due to the interaction with the neighboring lithium and fluorine atoms. The optical spectra were investigated, and the density of the different kinds of crystal defects like F, F 2 or F 3 centers can be determined from the intensity of the respective absorption lines [4,15,17,18]. Some dynamical studies and annealing experiments were performed [1,19], which show that the F centers are stable at room temperature, but recombine at temperatures higher than 360 K [19].…”