• H D Bist

      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

      More Details Abstract Fulltext PDF

      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.

    • π* ←π electronic transition in hydroxy-benzonitriles. I. Orthohydroxybenzonitrile

      S Ram J S Yadav H D Bist

      More Details Abstract Fulltext PDF

      The longest wavelengthπ* ←π electronic band system of ortho-hydroxybenzonitrile vapour through the absorption technique has been reported for the first time. Assuming a planar molecular geometry in both the electronic states, the molecule is classified into aCs point group, and the present spectrum is attributed to1A′ ←1A′ type corresponding to electric dipole forbidden transition1B2u1A1g (260 nm band system) of benzene. The most intense band at 33914 cm−1 has been assigned as the 0, 0 band, and the other vibronic bands have been interpreted in terms of the excited state and a few ground state fundamentals.

    • Optical transitions of Eu3+ ions in EuCl3 solutions

      S Ram O P Lamba H D Bist

      More Details Abstract Fulltext PDF

      The optical absorption spectra of EuCl3 in aqueous and acidic solutions were measured in the visible anduv regions of the spectrum. The concentration as well as the temperature of the solutions were varied to establish an accurate free-ion energy level scheme of Eu3+. The energy levels were assigned on the basis of a correlation between the calculated and the experimentally observed transition energies and associated band intensities.

  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.