Electron Paramagnetic Resonance of Divalent Manganese in Ammonium Chloride

Abstract
The electron paramagnetic resonance of divalent manganese in NH4Cl has been studied at X‐band frequencies. Several unexpected features of the spectrum are observed because the microwave quantum used is very close to the smaller of the two electronic zero‐field splittings. The entire spectrum can be explained by assuming there is a vacancy in the nearest‐neighbor NH4 + position to each manganese ion.