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Abstract
Cathodoluminescence (CL) and photoluminescence (PL) of Sm n+ ( n=2,3) in crystalline, glassy SrB 4O 7, and polycrystalline SrSO 4, BaSO 4 were traced in order to distinguish between the valence state 2+ and 3+. Whereas PL selectively excites both valence states, Sm 3+ is preferentially seen by CL. Differences in measured spectra are most likely due to the effect of ionization of Sm 2+ to Sm 3+ by accelerated electrons and an energy transfer from the host to Sm 3+.
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