Kinetics of transformation of Eu2+ dimers in NaCl crystals in a static magnetic field of 15 T

A static magnetic field of up to 15 T is found to affect the photoluminescence excitation spectra of NaCl: Eu crystals. The magnetic field has an effect on the excitation spectra starting at the stage at which dimers are formed through diffusion in the crystals. At earlier stages of impurity aggregation, the magnetic field affects the kinetics of dimer accumulation. It is revealed that the dimer transformation stimulated by the magnetic field involves stages that last for 10–15 min at room temperature in a static magnetic field of 15 T and, hence, are shorter than the aggregation time. Luminescence studies of dimers, which are the main dislocation stoppers in NaCl: Eu crystals, make it possible to explain the specific features of the magnetoplastic effect observed previously in these crystals.