Origin of the Puzzling Narrow Line in the EPR Spectrum of Triplet C70
X band light induced continuous wave EPR (LEPR) spectroscopy was employed to study triplet fullerene C70, 3C70, in glassy decalin and o terphenyl. The EPR lineshapes observed in the temperature ranges between 50 and 130 K (for decalin) as well as between 77 and 200 K (for OTP) were successfully simulated. The results show that the narrow LEPR line does not originate from a radical S 1/2, but arises from jumps of the EPR lines within the LEPR spectrum of 3C70 between symmetrical LEPR positions provided by paramagnetic relaxation process of 3C70. This process can be described by a relaxation induced coherence transfer between two resonance transitions having close transition frequencies.