LOCAL SYMMETRY AND MUTUAL INTERACTION OF MN2+ IONS IN GLASSES

The intensity of two electron paramagnetic resonance signals with effe ctive g-values of 2.0 and 4.3 was measured in the temperature region 4 -40 K in Mn2+-doped halide glasses of the type CdCl2-PbCl2-KI and in c halcohalide glasses of the type GeS2-Ga2S3-MnCl2. The experimental rat io of the intensities of the two resonances in glasses with an Mn2+ io n content lower than 1.0 mol% MnCl2 was fitted to the ratio of the two Boltzmann distribution functions calculated with the spin-Hamiltonian parameters of the two magnetically active centers. Some type of excha nge interaction was assumed to be present in the other glasses. This i nterpretation agrees with the experimental evidence of changes of the shape of the resonance signal as well as with the simulation of the in tensity ratio curves.