Zero-Field Splitting Parameter of the Mn++ Ion in Glassy and in Polycrystalline Media

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Abstract
An attempt has been made to measure the zero‐field splitting parameter of the manganous ion in glassy and polycrystalline media from the relative intensities of the allowed transitions of the EPR hyperfine spectrum. A value of this parameter D=96±5 G was determined for manganous ion in glassy 12N HCl for T≤140°K, and of D=145 G in glassy methnol for T≤118°K. In the crystalline phase, the D term in both cases approximately doubled. A value of D intermediate between that of the glassy phase and the final crystalline phase was found for methanol between temperatures of 120° and 135°K.