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• W2052392011 abstract "Ultraviolet photoelectron spectroscopy, optical transmission, fluorescence excitation spectroscopy and time-resolved fluorescence spectroscopy are used to investigate the scintillation mechanisms of cerium fluoride (CeF3) and of lanthanum fluoride doped with cerium in concentrations between 0.01 and 50 mol% cerium. In LaF3:Ce, the absorption of either optical or ionizing radiation directly or indirectly results in excitation of the Ce3+ 4f electron to the lowest 5d level followed by 5d→4f fluorescence at 284–300 nm. Whereas for optical excitation the fluorescence has a 20 ns decay time, for ionizing radiation there is an additional faster (2–10 ns) initial decay component. As the cerium concentration increases, another band appears that partially absorbs the 284–300 nm emission and re-radiates it in a broad band peaking at 340 nm and having a longer (∼30 ns) decay time. In the limit of 100% CeF3, radiation trapping is very pronounced. The additional absorption and emission bands present at large Ce concentrations are attributed to Ce3+ ions in perturbed sites. The relative efficiency for excitation of unperturbed and perturbed cerium sites via the Ce3+ 5d and 6s bands, the F- 2p valence band, and the Ce3+ or La3+ 5p core levels are determined from fluorescence excitation spectra." @default.
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• W2052392011 date "1994-02-01" @default.
• W2052392011 modified "2023-09-30" @default.
• W2052392011 title "Scintillation mechanisms in cerium fluoride" @default.
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• W2052392011 doi "https://doi.org/10.1016/0022-2313(94)90026-4" @default.
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