• A S Deshpande

      Articles written in Pramana – Journal of Physics

    • Phonon density of states of tetracyanoethylene from coherent inelastic neutron scattering at Dhruva reactor

      S L Chaplot R Mukhopadhyay P R Vijayaraghavan A S Deshpande K R Rao

      More Details Abstract Fulltext PDF

      Inelastic neutron scattering experiments to determine phonon density of states of coherent scattering samples of polycrystalline complex solids are generally intensity-limited and therefore are feasible only at high flux facilities. Phonon density of states of the monoclinic phase of tetracyanoethylene at 300 K, obtained using the medium resolution triple axis spectrometer at the new Indian medium flux reactor Dhruva are reported here. The raw data is converted to the “neutron weighted” phonon density of states by applying suitable corrections. Comparison made with results from a theoretical calculation based on a semirigid molecule model of lattice dynamics is fair. Results from Dhruva are also consistent with that obtained (to be published) at the high flux pulsed neutron source (ISIS) of the Rutherford Appleton Laboratory in United Kingdom.

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