The individual sites present in ThO2doped with Eu3+and Er3+have been studied by site selective spectroscopy. A cubic site corresponding to a rare earth charge compensated distantly and two sites having local charge compensation have been identified. One of the locally compensated sites is present only at moderate temperature while the other is formed at higher temperatures and is stable to high temperatures. The measurements are related to catalytically excited fluorescence of ThO2, previous luminescence measurements, and magnetic resonance experiments that observe the presence of local F_charge compensation of rare earth dopants. © 1982.
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