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- W1972461287 abstract "It was recently discovered that in electron-irradiated germanium doped with oxygen a local vibrational mode occurs at $669phantom{rule{0.2em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ that could be ascribed to the negatively charged oxygen-vacancy complex $({mathrm{VO}}^{ensuremath{-}})$. In the $669phantom{rule{0.2em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ band and in another unassigned band at $731phantom{rule{0.2em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ due to a different defect, fine structures indicating the occurrence of a germanium isotope splitting of the modes could be partly resolved. We report here the results of high-resolution $(=0.02phantom{rule{0.2em}{0ex}}{mathrm{cm}}^{ensuremath{-}1})$ infrared measurements at liquid helium temperature of bands at $635,669,716,mathrm{and}phantom{rule{0.3em}{0ex}}731phantom{rule{0.2em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$. In this work, the experimentally observed splitting of all four local vibrational modes and the amplitudes of the individual components within each mode are accurately predicted from a nonlinear symmetric $mathrm{Ge}ensuremath{-}mathrm{O}ensuremath{-}mathrm{Ge}$ quasimolecule embedded in the germanium lattice. Electron paramagnetic resonance measurements have also been performed on an $mathrm{O}$ doped $^{74}mathrm{Ge}$ quasi monoisotopic sample after electron irradiation. The symmetry of the dominant paramagnetic defect in the sample is found to be orthorhombic I and the principal $g$ values are in good agreement with those reported earlier for the ${mathrm{VO}}^{ensuremath{-}}$ center. Through annealing (at $120phantom{rule{0.2em}{0ex}}ifmmode^circelsetextdegreefi{}mathrm{C}$) a correlation can be made between the intensity of this electron paramagnetic resonance signal and the infrared band at $669phantom{rule{0.2em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, giving explicit support to earlier identifications of these signals as due to ${mathrm{VO}}^{ensuremath{-}}$." @default.
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- W1972461287 date "2004-07-13" @default.
- W1972461287 modified "2023-10-18" @default.
- W1972461287 title "High-resolution local vibrational mode spectroscopy and electron paramagnetic resonance study of the oxygen-vacancy complex in irradiated germanium" @default.
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- W1972461287 doi "https://doi.org/10.1103/physrevb.70.035203" @default.
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