Abstract
The higher-order $\ensuremath{\Delta}m=3$ and $\ensuremath{\Delta}m=4$ transitions in MgO: ${\mathrm{Fe}}^{2+}$ (effective spin = 1) have been observed directly by acoustic paramagnetic resonance. The angular dependence and temperature dependence are found to differ significantly from the normally "allowed" $\ensuremath{\Delta}m=1$ and $\ensuremath{\Delta}m=2$ transitions. A theory due to Fedders and Myles agrees well with the observed behavior of the $\ensuremath{\Delta}m=4$ line.
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