Temperature dependence of the Raman bandwidths for the lattice and internal modes in ammonium halides close to the lambda-phase transitions


YURTSEVEN H. H. , Tuzer T. U.

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, vol.70, no.2, pp.445-448, 2008 (Peer-Reviewed Journal) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 70 Issue: 2
  • Publication Date: 2008
  • Doi Number: 10.1016/.j.saa.2007.11.030
  • Journal Name: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.445-448

Abstract

We study here the temperature dependence of our Raman bandwidths for the upsilon(5) lattice modes of NH4Cl (T-lambda = 241 K) and NH4Br (T-lambda = 235 K) and for the upsilon(2) internal mode of NH4Cl close to the lambda-phase transitions.