Phonon Spectroscopy of Low-Energy Vibrations of Interstitial Oxygen in Germanium

Abstract

I. Physika1isches lnstitut, Universitiit Stuttgart. W·7rxxl Stuttgart SO, Fed. Rep. of Gennany In oxygen doped germanium we find by phonon spectroscopy with superconducting tunnelling junctions [II (Fig.I) a series of states from 0.18 meV up to 4.08 meV above the ground state (Fig.3). The sequence can be approximated by a free rotation of the interstitial oxygen atom (