The structures of two O-related luminescence centers in O-doped samples were investigated by using photoluminescence and photoluminescence-detected electron paramagnetic resonance techniques. One of the O-related luminescences, which peaked at 2.83eV, was associated with an excited triplet state (S = 1) of an O–vacancy complex, with the z-axis of the fine-structure tensor parallel to the <110> direction. This complex was an O on a F lattice site, with a next-nearest F vacancy along the <110> direction. A luminescence at 2.25eV was also associated with a triplet state. Its photoluminescence-detected electron paramagnetic resonance spectrum was attributed to O–vacancy complexes with a nearest F vacancy along the <100> direction.

Optically Detected Magnetic Resonance Investigation of Oxygen Luminescence Centers in BaF2. U.Rogulis, S.Schweizer, J.M.Spaeth: Journal of Physics - Condensed Matter, 2002, 14[28], 6949-56