Raman scattering in GeSi alloys

Room temperature Raman spectra are reported for polycrystalline GeSi alloys as a function of composition. The frequencies and linewidths of the three main peaks show some disagreement with previously reported work; the results are discussed within the theories of local and resonance modes of impurities, where possible. Minor scattering peaks and second-order spectra, as well as anomalous behavior in several inhomogeneous samples, are also reported and discussed.