Direct observation of electron spin density on TDAE cations in the ferromagnetic state of solid TDAE-C-60

N-14 electron spin echo envelope modulation (ESEEM) and H-1 nuclear magneti c resonance (NMR) techniques have been employed in order to measure the unp aired electron spin density of amino nitrogens and CH3 protons, in the low temperature ferromagnetic state of solid TDAE-C-60. Well resolved N-14 ESEE M patterns were obtained for the first time below 9 K, and their analysis r eveals an extremely low unpaired electron spin density on specific TDAE nit rogen sites. Also,H-1 NMR line shape measurements corroborate a stepwise in crease of the electron spin density on the CH3 protons below 9 K that is ac companied by the onset of an activated law for H-1 1/T-1 with temperature.