Abstract
The effect of doping with tin on the ν3 vibrational mode of oxygen in Ge has been studied. The appearance of three new series of absorption lines besides the ν3 oxygen vibration spectra was found. The spectrum structure in each series of lines found is similar to the ν3 oxygen spectrum structure in Ge. But unlike the ν3 mode, the fine structure due to rotational-vibrational interaction of the ν3 and ν2 modes is not observed and the spectrum structure remains up to temperatures of 130 K. The found three sets of absorption lines are ascribed to the ν3 vibration of interstitial oxygen disturbed by tin atoms located in the nearest environment. The assumption has been made that no rotation of oxygen around a Ge-Ge bond for a Ge-O-Ge quasimolecule disturbed by a neighbour Sn atom occurs.
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