ERP of Mn2+doped in ammonium iodide single crystals has been studied at room temperature (sim;300 K) and atXband (sim;9.3 GHz). An axial complex with the following spinhyphen;Hamiltonian parameters has been observed:gpar;=2.0014plusmn;0.0005,gpar;=2.0028plusmn;0.0005,b02=minus;1611plusmn;2 G,b04=6plusmn;1 G, Verbar;AVerbar;=Verbar;BVerbar;=90plusmn;1 G. Some unusual features observed in the spectra atXband due to the large value ofb02have been discussed.
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