Line Shapes of Electron Paramagnetic Resonance Signals Produced by Powders, Glasses, and Viscous Liquids

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Abstract
The line shapes arising from randomly oriented particles in a fixed position have been calculated. It has been found that it is possible to determine the three principal g factors with relatively high accuracy and without investigating single crystals. Measurements on powders of CuCl2·2H2O and CuSO4·5H2O are used as examples. In addition, the influence of Brownian rotation in viscous liquids on line shapes has been studied. Equations have been derived for the case of high viscosities, supplementing the well‐known ones given by McConnell [J. Chem. Phys. 25, 709 (1956)]. To a first approximation, the effect of decreasing viscosity can be described by an over‐all diminishing line width and an unchanged line shape function. The hyperfine splittings are neglected, but can be taken into account.

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