ESR Line Shapes for Triplets Undergoing Slow Rotational Reorientation

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Abstract
The stochastic Liouville method is applied to analyze the general problem of unsaturated ESR line shapes for triplets undergoing rotational diffusion. Detailed line shape simulations are obtained for the cases of high-, low-, and zero-field resonance, large or small values of an axially symmetric zero-field splitting, and slow through fast rotational diffusion. It is shown how all these parameters can have profound effects on the observed ESR spectra.