Optical absorption and electron spin resonance studies of Cu~(2+) in Li_2O-Na_2O-B_2O_3-As_2O_3 glasses

摘要

The local structure around Cu~(2+)ion has been, examined by means of electron spin resonance and optical absorption measurements in xLi_2O-(40 - x)Na_2O-50B_2O_3-10As_2O_3 glasses. The site symmetry around Cu~(2+) ions is tetragonally distorted octahedral. The ground state of Co~(2+) is d_(x~2-y~2) The glass exhibited broad absorption and near infrared region and small absorption band around 548 nm, which was assigned to the ~2B_(1g)- > ~2E_g transition.