Detection of LO mode in v-SiO2 by infrared diffuse reflectance spectroscopy

Rui M. Almeida, Theresa A. Guiton, Carlo G. Pantano

Research output: Contribution to journalLetterpeer-review

38 Scopus citations


It has been found that the high frequency longitudinal optical (LO) mode in vitreous SiO2 can be observed in the diffuse reflectance spectra of bulk glass or powder compacts. The sensitivity to this mode arises because of the off-normal components of reflectance which are collected in the diffuse reflectance spectra. The frequency and intensity of the mode are only approximately determined, however, and Kramers-Kronig transformation of specular reflectivity data is required to calculate precisely the mode location and intensity. The significance of this finding is that, in contrast to the use of infrared reflectance or Raman spectroscopy, where polished bulk specimens or single crystals are required, the present approach permits the determination of LO modes with with powder.

Original languageEnglish (US)
Pages (from-to)238-241
Number of pages4
JournalJournal of Non-Crystalline Solids
Issue number2
StatePublished - Apr 2 1990

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


Dive into the research topics of 'Detection of LO mode in v-SiO2 by infrared diffuse reflectance spectroscopy'. Together they form a unique fingerprint.

Cite this