Low field hyperfine structure in the EPR spectra of Mn2+ containing glasses

Hyperfine structure observed at g′≃9.4 and g′≃4.3 in the EPR spectrum of Mn2+ in several glasses is analyzed on the basis of the theory of Griscom and Griscom [J. Chem. Phys. 47, 2711 (1967)] and Aasa [J. Chem. Phys. 52, 3919 (1970)]. The complex hyperfine structure at g′=4.3 is found to be a superposition of three sextets, but at g′=9.4 only a single set of six hyperfine lines is observed.