• S K Deb

      Articles written in Pramana – Journal of Physics

    • Raman scattering study of LiKSO4—phases II and III

      M L Bansal S K Deb A P Roy V C Sahni

      More Details Abstract Fulltext PDF

      Detailed Raman scattering investigation of LiKSO4 in phases II and III across the transition temperatureTc ≃ 700 K is reported. Abrupt change in frequency and line width of the external and internal modes have been observed. Analysis of the results suggests lithium positional disorder and sulphate orientational disorder in the high temperature phase (II). The results also throw some light on the existence of twin domains in the crystal.

    • Interpolation model for molecular reorientation in gases and liquids

      S K Deb A K Sood

      More Details Abstract Fulltext PDF

      The interpolation model for molecular reorientation in gases and liquids has been extended to the case for symmetric top molecules. It has been compared with experimental correlation functions for linear as well as prolate and oblate symmetric top molecules. The agreement is excellent for systems where the intermolecular torque is small. With increasing torque, there is discrepancy at short times whereas at intermediate and long times the decay is described quite well. However for liquids at low temperatures, the description of molecular reorientation within the framework of this model is unsatisfactory.

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