Abstract
The effect of the molecular reorientation on the lineshapes in nonlinear EPR spectroscopy is discussed. The ELDOR and LODEPR techniques are considered, and the reorientation process is assumed to follow a random-jump model, which is likely to apply when the probe and the solvent molecules have comparable dimensions. The stochastic Liouville equation is then solved in a compact form, avoiding lengthy expansions in the angular variables of the problem. In the no-saturation limit, the intensity of the LODEPR spectra is found to be proportional to the intensity of the corresponding conventional EPR spectra at any rate of motion.
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