TEMPERATURE-DEPENDENCE OF H-1-NMR RELAXATION IN HYDROGENATED AMORPHOUS-CARBON SAMPLE SERIES

A two-exponential spin-lattice (T-1) relaxation process of hydrogen nu clear magnetization was found in a series of hydrogenated amorphous ca rbon samples prepared under different self-bias conditions from benzen e. The temperature dependence of these relaxation times reveals the di fferent dynamic background of the two sub-systems. Low activation ener gies (depending on self-bias voltages) were measured for the longer re laxation time components; temperature independence was detected for th e shorter relaxation time components.