Identification of raman defect lines as signatures of ring structures in vitreous silica

Alfredo Pasquarello, Roberto Car

Research output: Contribution to journalArticle

343 Scopus citations

Abstract

By analyzing the vibrational eigenmodes of a model structure obtained previously by quantum molecular dynamics, the two sharp features appearing in the Raman spectrum of vitreous silica could conclusively be assigned to three- and four-membered ring structures embedded in the network. The projections of the eigenmodes onto oxygen breathing motions in these rings yield well defined peaks at frequencies in striking correspondence to the positions of the Raman lines. The good agreement between calculated and measured shifts upon isotopic substitution further confirms this assignment.

Original languageEnglish (US)
Pages (from-to)5145-5147
Number of pages3
JournalPhysical review letters
Volume80
Issue number23
DOIs
StatePublished - Jan 1 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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