Abstract
We show that longitudinal optical (LO) vibrational modes account for several previously unexplained peaks in the Raman spectra of vitreous Ge and Si. 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.
- Received 29 July 1976
DOI:https://doi.org/10.1103/PhysRevLett.37.1474
©1976 American Physical Society