Abstract
The effect of small distortions from cubic symmetry on the EPR line positions for S = 3/2 is calculated using a perturbative approach for the case where there is a well resolved hyperfine splitting. It is found that for the Ms = −1/2 to Ms = +1/2 transitions, where the line shifts due to these distortions are small compared to the linewidths, the centre of gravity of each line show a pseudo‐cubic angular dependence −9/5 (udβH + Udm) [1 – 5(α21α22 + α22α23 + α23α21)] with ud/Ud = −3g/(11A), and αi the direction cosines of the magnetic field with respect to the cubic axes.