Gienger, MartinGlaser, MarkusLassmann, Kurt2009-10-122016-03-312009-10-122016-03-311993318040573http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-47243http://elib.uni-stuttgart.de/handle/11682/4923http://dx.doi.org/10.18419/opus-4906In oxygen doped Ge we find by phonon spectroscopy with superconducting tunnelling junctions a series of lines between 0.18 meV and 4.08 meV which can be interpreted as due to low lying states of the interstitial oxygen (Oi) as a rigid rotator around a <111>-axis slightly perturbed by the lattice potential. The sequence of transitions can be fit assuming a binding angle of (106 ± 1)° which is much smaller than the value of (162 ± 1)° for Oi in Si. Line shifts and splittings with uniaxial stress along <100>, <110> and <111> are in qualitative agreement with this interpretation.eninfo:eu-repo/semantics/openAccessPhononenspektroskopie , Sauerstoff , Germanium530article2014-09-11