Abstract
In yttrium orthoaluminate crystals doped with the 151Eu isotope, the paramagnetic centers Eu2+, Cr3+, Gd3+, and Mo3+ have been detected. The fine structure parameters of the spin Hamiltonian of these centers were determined or refined. The account of the orientational behavior of previously unobserved forbidden transitions has been taken for the Cr3+ centers. It is shown that two Mo3+ signals that are detected in magnetic fields parallel to the crystallographic axes do not belong to different molybdenum centers, but are two intra-doublet transitions of the same center.
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