Esr Lineshapes and Saturation in the Slow Motional Region; Eldor*

It is shown how the stochastic Liouville approach of Freed, Bruno. and Polnaszek for describing ESR lineshapes in the slow motional region may be applied to the ELDOR experiment. It is possible, in the slow motional region, to pump with a saturating microwave field at one resonant frequency corresponding to a particular orientation and observe effects from the rotational motion in transmitting the saturation to another resonant position. Some effects are illustrated by simulation of ELDOR spectra for a simple ESR line in the slow motional reson.