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Interconfigurational 4f 10 5d↔4f 11 transitions of the Er 3+ ion in the YAG host were studied under both VUV photon (synchrotron radiation) and electron beam excitation. It was found that the lowest low-spin 5d level of the Er 3+ ion has a rather large energy gap to the next lower 4f 2 D(2) 5/2 crystal-field level, which results in a relatively low rate...
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