Longitudinal Optical Vibrations in Glasses: Ge<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> and Si<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

F. L. Galeener; G. Lucovsky

doi:10.1103/PhysRevLett.37.1474

Longitudinal Optical Vibrations in Glasses: Ge $O_{2}$ and Si $O_{2}$

F. L. Galeener and G. Lucovsky

Phys. Rev. Lett. 37, 1474 – Published 29 November 1976

Abstract

We show that longitudinal optical (LO) vibrational modes account for several previously unexplained peaks in the Raman spectra of vitreous Ge $O_{2}$ and Si $O_{2}$ . Identification of LO modes in these and other glasses reduces the complexity of the spectra that must be explained by simple structural models. It also follows that long-range (Coulomb) forces should be included in complete theories of the vibrational properties of many glasses.