Articles written in Pramana – Journal of Physics
Volume 2 Issue 3 March 1974 pp 138-147 Solids
The shape and fine structure of the x-ray LIII absorption discontinuity of ytterbium (
Volume 6 Issue 5 May 1976 pp 305-311 X-Ray Crystallography
In Lytle’s theory for the extended fine structure in x-ray absorption spectra, the potential at the boundary of the ‘equivalent sphere’ around the absorbing atom, having volume equal to that of the Wigner-Seitz cell is considered to be infinite. It has been observed that Lytle’s theory is applicable only in the case of metals and metallic systems. In the present paper the extended fine structure associated with the LIII absorption spectra of some systems of ytterbium is interpreted on the basis of Lytle’s model, modified by using a finite potential instead of an infinite one at the boundary of the equivalent sphere. The values of this potential are estimated for eight systems of ytterbium. It has been shown that there exists a correlation between the potentials and covalency of the compounds.
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