Axial V centers in polycrystals were studied by using electron paramagnetic resonance. A paramagnetic S- ion arose near to an alkaline metal ion which substituted for a cation of the host lattice when a hole produced by X-rays at 77K was captured. The centers were observed at 10 to 25K. The superhyperfine structures arising from a 23Na nucleus and a 7Li nucleus were observed. The parameters (g-tensor, A-tensor, thermal decay) of the V centers were determined.

EPR of [Li]0, [Na]0, and [K]0 Centers in SrS and CaS Polycrystals. V.Seeman, M.Danilkin, A.Ots, E.Pedak, L.Pung, E.Pärnoja: Physica Status Solidi B, 2004, 241[1], 170-4