The chlorine A center has been identified in CdTe using photoluminescence and optically detected magnetic-resonance techniques. The A center is found to be an acceptor with a binding energy ${\mathit{E}}_{\mathit{a}}$=120±3 meV and consists of a Cd vacancy and a Cl donor on a nearest Te site. The defect has trigonal symmetry with ${\mathit{g}}_{\mathrm{?}}$=2.2 and ${\mathit{g}}_{\mathrm{\perp }}$=0.4, assuming an effective spin S=1/2. The interactions with the three Te neighbors are also resolved and the measured isotropic ligand hyperfine interaction amounts to (2.7±0.4)×${10}^{\mathrm{-}2}$ ${\mathrm{cm}}^{\mathrm{-}1}$.

• Received 8 November 1991

DOI:https://doi.org/10.1103/PhysRevB.45.6247