Jahn‐teller structure in ³A₂(³F) → ³T₁ (³F) absorption band of CdS:Ti²⁺

Abstract

Abstract The absorption spectrum of Ti 2+ centres in CdS betwccn 0.3 and 1.5 eV is measured in the temperature range 10 to 295 °K The spectrum can be explained on the basis of crystal‐field theory. A detailed analysis of the temperature dependence of the 3 A 2 , → 3 T 1 ( 3 F) band shows that the triplet structure of this band is due to strong interaction with τ 2 type vibrational modes of phonon energy 3.3 meV. This analysis is based on the theory of Toyozawa and Inoue [6] and the method of moments of Henry et al. [14]. Effects of the autoionization of the 3 T 1 state (which has been shown to be located in the conduction band [13]) are believed to be seen at low temperatures.