Raman Spectra of SiF4 and GeF4 Crystals.
Abstract
The Raman scattering spectra of large single crystals of SiF4 and GeF4 at 77K are reported. These data have been reinterpreted based on the absence of any observable changes in the spectra for scattering angles between 0 and 90 deg. The previous assignment of the dipole allowed nu3 and nu4 modes in terms of a TO/LO splitting (i.e., polariton) model is thereby shown to be incorrect. In the absence of an apparently correct crystal structure, an exact interpretation of the data in terms of a factor group-exciton analysis is not possible; nonetheless all observations are shown to be consistent with a multimolecular primitive (non-cubic) unit cell. mixed SiF4/GeF4 crystal spectra have also been obtained which demonstrate that GeF4 does not substitute into the SiF4 lattice but that SiF4 does enter the GeF4 crystal substitutionally. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1977
- Accession Number
- ADA039706
Entities
People
- Elliot R. Bernstein
- Genevive Meredith
Organizations
- Colorado State University