Raman frequency shifts for the rotatory lattice mode close to the melting point in ammonia solid I

Karacali H., Yurtseven H.

JOURNAL OF PHYSICAL CHEMISTRY B, vol.109, no.35, pp.16974-16978, 2005 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 109 Issue: 35
  • Publication Date: 2005
  • Doi Number: 10.1021/jp058111d
  • Journal Name: JOURNAL OF PHYSICAL CHEMISTRY B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.16974-16978
  • Middle East Technical University Affiliated: Yes

Abstract

We correlate here the thermal expansivity alpha(p) to the frequency shifts 1/v(partial derivative v/partial derivative P)(T) for the rotatory lattice (librational) mode in ammonia solid I close to the melting point. This is carried out for the pressures of 0, 1.93, and 3.07 kbar at various temperatures for this solid structure. By obtaining linear plots of alpha(p) versus 1/v(partial derivative v/partial derivative P)(T) for the pressures studied, we extract the values of the slope dP(m)/dT according to our spectroscopic relation. Our calculated values of dP(m)/dT can be compared with the experimental ones for ammonia solid I close to the melting point.