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    • Modified Pippard relationship describing the Raman frequency shifts of the rotatory lattice mode of ammonia solid II in the vicinity of its melting point

      H Karacali H Yurtseven

      Volume 117 Issue 6 November 2005 pp 677-683

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/117/06/0677-0683

    • Keywords

       

      Thermal expansivity; librational mode; Raman frequency

    • Abstract

       

      We relate in this study the thermal expansivity, αP, to the Raman frequency shift (1/v)(∂v/∂P)T for the rotatory lattice (librational) mode in ammonia solid II near its melting point. We have used our calculated Raman frequencies of this mode for pressures of 3.65, 5.02 and 6.57 kbars for this crystalline system. The values of the slope, dPm/dT, which we deduced from our spectroscopic relation, are compared with those obtained experimentally. In particular, our computed slope value for the pressure of 5.02 kbar is in very good agreement with the empirical result.

    • Author Affiliations

       

      H Karacali1 H Yurtseven1

      1. Department of Physics, Middle East Technical University, Ankara - 06531, Turkey

    • Dates

       
      Published
      November 2005
      Manuscript received
      30 September 2004
      Manuscript revised
      14 July 2005

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