CALCULATION OF THE RAMAN FREQUENCIES AS A FUNCTION OF TEMPERATURE IN PHASE III OF NH4I


Kavruk D., YURTSEVEN H. H.

MODERN PHYSICS LETTERS B, vol.24, no.8, pp.817-824, 2010 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 8
  • Publication Date: 2010
  • Doi Number: 10.1142/s0217984910022792
  • Title of Journal : MODERN PHYSICS LETTERS B
  • Page Numbers: pp.817-824

Abstract

We study here the temperature dependence of the Raman frequencies for the overtone 2 nu(6) of the librational mode nu(6) in phase III of NH4I. By using the experimental infrared frequencies of the 2 nu(6) mode, we predict the Raman frequencies of this overtone 2 nu(6) mode as a function of temperature at atmospheric pressure in phase III of NH4I. Our calculations indicate that the Raman frequencies of 2 nu(6) exhibit anomalous behavior at around 110 K (P = 0) in phase III of NH4I, as observed experimentally.