Zur Konzentrationsabhängigkeit der Elektronenspin-Relaxationszeiten von Diphenyl-Picryl-Hydrazyl in fester Phase
The influence of exchange and dipol interaction on the EPR-relaxation timesT1 andT2 of DPPH has been measured in theX-band between 295 and 2°K. The spinconcentration has been varied between 1.5·1021 spins/cm3 (single crystals) and 1.5·1018 spins/cm3 (solid solution in polystyrene). The EPR absorption was saturated stationarily. This gave the productT1T2 from the saturation curve and the timeT2 from saturation broadening of the absorption spectrum.