• D P Khandelwal

      Articles written in Pramana – Journal of Physics

    • Infrared spectra of BeSO4.4H2O and its deuterated analogue in 4000–1200 cm−1 region

      Bipin K Srivastava D P Khandelwal H D Bist

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      IR spectra of BeSO4.4H2O and its deuterated analogue at ∼300 K and ∼110 K are reported in the region 4000–1200 cm−1 using thin film and nujol mull techniques. The observed bands have been assigned as the internal modes of the water and the overtones and combinations of various modes using the recently revised assignments of SO42− and Be(aq)4 fundamentals in the region 1200–250 cm−1 (Srivastavaet al 1976). The splitting of the internal modes of water has been discussed in the light of the effects of deuteration and cooling and it is shown that all the water molecules in a unit cell are asymmetric but crystallographically equivalent.

    • Infrared spectra of BeSO4.4H2O and its deuterated analogue at 110K in 1200–250 cm−1 region

      Bipin K Srivastava D P Khandelwal H D Bist

      More Details Abstract Fulltext PDF

      IR absorption spectra of BeSO4.4H2O and its deuterated analogue are reported in the region 1200–250 cm−1 at 110 K. The half-widths and relative integrated intensities of the bands are also reported. The study largely confirms the assignments for thev3 andv4 modes of SO42− ion and thev3 mode of Be(aq)42+, complex as made by Diemet al. The assignments of the other modes of SO42− and Be(aq)42+, and the librational modes of water are given a more solid footing as result of the present investigation.

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