P K Narayanaswamy
Articles written in Proceedings – Section A
Volume 26 Issue 2 August 1947 pp 121-131
Volume 26 Issue 6 December 1947 pp 511-520
With the λ 2536 radiation of the mercury arc as exciter, the Raman spectrum of calcite has been studied at the temperatures 90°, 185°, 300°, 343°, 398°, 438°, 508°, 583°, 638° and 698° K. It is found that
Volume 26 Issue 6 December 1947 pp 521-530
The Raman spectrum of quartz has been studied at a series of nine temperatures from 85° to 685°K. Data regarding the variations in frequency shift
Volume 27 Issue 4 April 1948 pp 311-315
The Raman spectra of water, heavy water D2O and ice have been studied using the λ2537 radiation of the mercury are as exciter. The shifts observed in water are Δν=60, 175, 475, 758, 1630, 3260, 3426, and 3610 cm.−1 Heavy water exhibits Raman bands at Δν=60, 176, 300–450, 1207, 2373, 2539 and 2670 cm.−1 The band at 60 cm.−1 is reported for the first time. A new Raman band is observed in the spectrum of ice extending from 213–310 cm.−1, the other Raman lines being at 52, 213·1, 3147, 3264 and 3347 cm.−1
Volume 27 Issue 4 April 1948 pp 336-341
The Raman spectra of cyclohexane, glycol and glycerine have been investigated with the λ 2536·5 radiation of the mercury arc as exciter. The wing in cyclohexane is found to extend up to ±95 cm.−1 from the exciting line. Five new lines are also observed in the spectrum. Glycol exhibits a wing of medium intensity extending up to ±130 cm.−1 and some new Raman lines are reported in its spectrum. Glycerine does not show any wing at all.
Volume 28 Issue 2 August 1948 pp 40-45
The Raman spectrum of barytes excited by the λ2536 radiation of the mercury arc has been studied at a series of eight temperatures ranging from 85° to 923°K., and data furnished regarding the variations in frequency shift and the width of the principal Raman lines. With increasing temperature a definite decrease in frequency shift is observed, the rate of decrease being greater at higher temperatures. While at low temperatures the internal frequencies of the SO4 ion are clearly split up into distinct components, these tend to coalesce as the temperature is increased. The lattice oscillations are observed to be much more temperature sensitive than the internal oscillations of the SO4 group. The 89 cm.−1 lattice line and the 648 cm.−1 internal frequency are comparatively the least affected by temperature variations.
Volume 28 Issue 5 November 1948 pp 417-422
With the λ 2536·5 resonance radiation of the mercury arc as exciter, the Raman spectrum of β-quartz has been recorded for the first time. Due to the increased symmetry, the spectrum of β-quartz exhibits fewer Raman lines than α-quartz. The variations in frequency shift and width of the Raman lines after the α-β transition point are also found to differ markedly from the corresponding changes observed below the critical temperature.