A study was made of the isolated Zn vacancy (VZn) in ZnSe by using optical detection of magnetic resonance and magnetic circular dichroism methods. Three magnetic circular dichroism bands, associated with VZn- were observed at 1.0, 1.4, and 2.65eV. The 1.4eV and 2.65eV bands had previously been observed in stress-induced linear dichroism studies. Detection of the band at 1.0eV confirmed a molecular orbital model which had been proposed for the defect. The magnetic circular dichroism optical detection of magnetic resonance signals were absorption-like and disappeared when a magnetic field was applied along the defect axis. This unusual behavior was explained by calculating the dipole transition probabilities of the magnetic circular dichroism transitions using this model; but expanded so as to include spin-orbit interactions.

D.Y.Jeon, H.P.Gislason, G.D.Watkins: Physical Review B, 1993, 48[11], 7872-83