MEASUREMENT OF THE LONGITUDINAL RELAXATION-TIME BY CONTINUOUS-WAVE, NONLINEAR ELECTRON-SPIN-RESONANCE SPECTROSCOPIES

We characterize a continuous-wave, nonlinear electron spin resonance s pectroscopy which detects the longitudinal component of the magnetizat ion, It is demonstrated that the signal is proportional to the Laplace transform of a relaxation function with decay time equal to the longi tudinal relaxation time T-1. The conclusion is reached by comparing T- 1 to the effective time T-1((eff)) being drawn by progressive saturati on for a nitroxide radical dissolved in supercooled o-terphenyl. (C) 1 998 Academic Press.