B T Deshmukh
Articles written in Pramana – Journal of Physics
Volume 6 Issue 3 March 1976 pp 183-187 Spectroscopy
A comparative study of
Volume 7 Issue 1 July 1976 pp 34-40 Solids
Fine powder of KI was coloured in an electrodeless discharge. Due to quick bleaching of the F centres produced in this method, it was possible to prepare the samples that were almost free from the F centres. High concentration of the electron deficient centres could be produced, which were studied by measuring the diffused reflectance. A band at 354 nm is shown to be composed of two overlapping bands. Further, growth of a band appearing at 265 nm is studied. Bleaching characteristics of the samples are studied and it is shown that, similar to F centre bleaching, bleaching of these samples also proceeds in at least two steps. The difference between two components of the bleaching curves is quite marked. Further it is showed that the components are related to the presence of different absorption bands and appear at different stages of colouration.
Volume 7 Issue 6 December 1976 pp 423-425 Solids
Average dislocation density in a number of electrolytically coloured and uncoloured crystals of KBr and KCl has been measured using the etch-pit technique. A decrease in density of dislocation after electrolytic colouration has been observed. This is attributed to the change in the dislocation pattern inside the crystals during colouration to produce more number of vacancies under the typical conditions of large electric field gradient at high temperature.
Volume 9 Issue 4 October 1977 pp 411-418 Solids
A comparative study of the optical and thermoluminescent properties of
Volume 9 Issue 5 November 1977 pp 537-544 Solids
Microcrystalline powders of NaCl, KCl and KBr are coloured in electrodeless discharge. Reflectance and TL studies of these coloured powders are reported. It is concluded that colouration of powders can be understood by considering them as an admixture of perfect and imperfect lattices, and differs from that of single crystals. It is suggested that some of the descrepancies reported on TL data may be due to such a difference. Further, it is shown that a better correlation can be had if TL data are presented along with the corresponding optical measurements. Adoption of such a procedure may help to remove the descrepancy in TL data.
Volume 25 Issue 6 December 1985 pp 723-731 Liquids
The mechanoluminescence (
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