Abstract
Individual low temperature (77K) fluorescence spectra of tetragonal (C4v), clustered, and long-lifetime optical centers of Tm3+ ions at the 3F4–3H6 transition are recorded and the lifetimes of these centers are measured. Analysis of the number and positions of the fluorescence lines of the long-lifetime optical center allows to suggest that it has tetragonal (C4v) local symmetry.
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