Articles written in Pramana – Journal of Physics
Volume 13 Issue 6 December 1979 pp 645-651 Molecular Physics
Normal co-ordinates, force fields and isotopic frequencies have been calculated for some
Volume 34 Issue 2 February 1990 pp 157-163
Ultrasonic absorption was measured in ortho and para hydroxy benzoic acid (OHBA and PHBA) in dioxan at room temperature for various solute concentrations. The variation of ultrasonic absorption in both solutions with the solute concentration showed two maxima, one at lower solute concentration and the other at higher solute concentration. The first maximum is explained as due to formation of hydrogen bonds between the O-H groups of OHBA and PHBA molecules and the oxygen of dioxan molecules and the second maximum as due to the COOH group of the OHBA/PHBA molecules and oxygen of dioxan molecules. In both systems the measured absorption is explained on the basis of Hall’s two-state model.
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