PIPPARD RELATIONS MODIFIED FOR THE RAMAN FREQUENCY SHIFTS CLOSE TO I-II PHASE TRANSITION IN S-TRIAZINE


YURTSEVEN H. H. , KURT M.

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, vol.25, no.32, pp.4641-4653, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 32
  • Publication Date: 2011
  • Doi Number: 10.1142/s0217979211059553
  • Title of Journal : INTERNATIONAL JOURNAL OF MODERN PHYSICS B
  • Page Numbers: pp.4641-4653

Abstract

The pressure dependence of the frequency shifts 1/omega(partial derivative omega/partial derivative T)(P) is calculated from the 1/omega(partial derivative omega/partial derivative P)(T) for the Raman modes I and IV according to the spectroscopic modifications of the Pippard relations. The observed Raman frequencies of those modes are used for this calculation close to the I-II phase transition in s-triazine. From the frequency shifts, the isothermal compressibility kappa(T) and the specific heat C-P are also calculated as a function of pressure close to the I-II phase transition in s-triazine. Our calculated values of 1/omega(partial derivative omega/partial derivative T)(P) kappa(T) and C-P can be compared with the experimental measurements at various pressures in the phases I and II of s-triazine.