• G Thyagarajan

      Articles written in Journal of Chemical Sciences

    • Rotational relaxation times from Raman band profiles for benzonitrile in different solvents

      H A Ahmed G Thyagarajan

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      The Raman band profiles of two vibrational bands of benzonitrile belonging to the a1 species (2243 and 1000 cm-1) were analysed by separating the isotropic and anisotropic components. Spectra of benzonitrile were recorded, using argon laser excitation, in solutions of CC14, CS2, cyclohexane, cyclohexanol and tertiary butyl alcohol-all having different viscosities. The rotational correlation times were evaluated from the band profiles. The results indicate that (a) the isotropic (and not the anisotropic) linewidth increases with increasing viscosity, which is attributed to the greater effect of intermolecular interactions on vibrational relaxation; and (b) the two modes of the same species give different relaxation times.

    • Temperature and radiation effects on the Raman bands of epoxy resin

      V Janarthanan G Thyagarajan

      More Details Abstract Fulltext PDF

      The C-H stretching, in-plane bending and out-of-plane bending modes of epoxy resin are investigated using Raman spectroscopy. Changes in Raman frequencies show a weakening of the hydrogen bonds on heating, but no effect on irradiation up to a total dose of 16 Mrad.

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