EPR of Mn2+ in As–S–I and As–Te–I glasses

The EPR spectra of Mn2+ were studied in the As–S–I and As–Te–I glass systems over a range of iodine concentration. For all samples the main spectral line was centered at g=2.00. Exchange narrowing was sometimes present with the higher manganese concentrations. Some of the As–S–I glasses exhibited partially resolved hyperfine structure. In the case of the As–Te–I glasses, under certain conditions an additional line was observed at g=4.3. This line was explained as arising from a particular zero field splitting, and it was found that |E|∼ |D/3|.