B N Khanna
Articles written in Pramana – Journal of Physics
Volume 14 Issue 6 June 1980 pp 509-521 Spectroscopy
The infrared spectra of (NH4)2M″(SO4)2.6H2O has been analysed in the region 4000–250 cm−1. The dynamics of each crystal has been discussed in terms of 234 phonon modes, including 3 acoustical ones, using the unit cell approximation. The ambiguity in the assignments of the bands in the region 900–500 cm−1 has been removed by assigning the bands in this region to the libratory modes of H2O molecules. It has been concluded that the NH4+ and SO42− ions have a symmetry lower than
Volume 18 Issue 5 May 1982 pp 427-437 Solid State Physics
The Raman spectra of the single crystal of K2Zn(SO4)2·6H2O belonging to
It has been inferred that both SO42− tetrahedron and [Zn(H2O)6]2+ octahedron undergo linear as well as angular distortions from their free state symmetries in the crystal.
Volume 18 Issue 6 June 1982 pp 511-516 Molecular Physics
A relationship between the torsional frequency (
Volume 36 Issue 2 February 1991 pp 151-161
The existence of rocking, wagging and twisting librations of different types of water molecules in tutton salts has been established from their ir spectra. These bands have been identified, following the intensity criterion of Miyazawa. The present assignments indicate that the bands due to libratory motion of H2O III in NH4Mn-, KNi-, KCo and KMn- and of H2O I in KMn- and KCu- tutton salts are out-of-plane H-bonded. The strength of the hydrogen bonding is the weakest in the (NH4)2Fe(SO4)2.6H2O.
Volume 39 Issue 2 August 1992 pp 157-161
Surface-enhanced Raman scattering (SERS) spectra of 2-cyanopyridine (2 CP) adsorbed on silver colloidal particles have been investigated. The prominent SERS bands are observed at 556, 612, 778, 1002, 1060, 1072, 1150 and 1240 cm−1. The absolute enhancement factor of the Raman signals in SERS studies has been estimated to be of the order of 102–105 for various bands. The 2CP molecules have been ascribed to adsorb on colloidal particles in standing up fashion.
Volume 39 Issue 6 December 1992 pp 597-614
Raman spectra of strontium borate binary glasses in the system
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