MULTIPLE-QUANTUM EPR TRANSITIONS OF MNII IN CASMNII PHOSPHOR

Multiple-quantum transitions in the electron paramagnetic resonance sp ectrum of naturally doped (almost-equal-to 10 ppm) CaS: Mn(II) powder are reported. Considerable resolution enhancement is achieved because of the lack of strain broadening of the EPR lines, due to the very goo d crystallinity of the powder. Multiple-quantum transitions are identi fied by their linewidth, their saturation behavior, and their magnetic field position. Two-, three-, and five-quantum transitions were ident ified, but not the four-quantum transitions. A line at g = 1.983 is as signed to Cr(III) impurities at low concentration, which also exhibits a two-quantum transition at high microwave power.