Saturation studies of the electron spin resonance due to trapped electrons in gamma-irradiated and photo-ionized organic glasses
Abstract
Relaxation times for trapped electrons in organic glasses at 77°K have been determined from the power saturation characteristics of the electron spin resonance. The spin-lattice relaxation time T1 is longer than 10–3 sec, and the spin-spin relaxation time T2 decreases with γ-irradiation dose. The saturation behaviour of a photo-ionized glass is similar to that of the corresponding γ-irradiated glass when the comparison is made at nearly the same bulk concentration of trapped electrons. Evidence for a non-uniform distribution of paramagnetic species in these irradiated glasses is critically examined, and attention is directed to difficulties of interpretation.