Abstract
Vibrational modes of substitutional oxygen on the anion site in cubic CdTe and wurtzite CdSe are identified from infrared (IR) absorption measurements on single crystals codoped with 18O and 16O. The 16O isotope variety of the defect in CdTe gives rise to a local vibrational mode at 349.8 (10 K), whereas the corresponding species in CdSe results in a doublet structure at 370.6 and 372.5 (10 K). The latter two modes are fully polarized for light parallel and perpendicular to the c axis of the CdSe crystal, respectively, and belong to the nondegenerate and the twofold degenerate E representations of the C3v point group.
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