Abstract
After room temperature x-irradiation of BaFBr single crystals grown from a stoichiometric mixture of and two new oxygen hole centres were discovered and investigated by electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR). One is an oxygen ion on a bromide site, however, with different superhyperfine (shf) interactions compared to the one investigated previously. The other one is an oxygen molecule with one oxygen on a fluoride site and one on the neighbouring bromide site, both sharing one hole. In total, now four different paramagnetic oxygen hole centres are known in stoichiometric BaFBr single crystals. Moreover, some shf interaction parameters of the centre were determined.
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