The Cl A-center was identified by using photoluminescence and optically detected magnetic resonance techniques. The center was found to be an acceptor with a binding energy of 0.12eV, and consisted of a Cd vacancy and a Cl donor on a nearest-Te site. The defect had trigonal symmetry, with g|| = 2.2 and g = 0.4; assuming an effective spin of S = ½. Interactions with the three Te neighbors were also resolved. The measured isotropic ligand hyperfine interaction was 0.027/cm.

D.M.Hofmann, P.Omling, H.G.Grimmeiss, B.K.Meyer, K.W.Benz, D.Sinerius: Physical Review B, 1992, 45[11], 6247-50