The effect of the Coulomb field on the oriented gas approximation
- 28 March 1976
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 9 (6) , 1065-1073
- https://doi.org/10.1088/0022-3719/9/6/023
Abstract
The oriented gas approximation for the polarizability of a molecular crystal neglects the Coulomb field of induced dipoles throughout the crystal. This would at first appear to be a serious shortcoming since the Coulomb field is of the same order as the applied field. The oriented gas model is extended by including the Coulomb field and draw a comparison to determine its effect. Sulphur is taken as an example for the calculation of Raman scattering tensors derived from the polarizability model. This extension of the oriented gas approximation gives a better justification of its validity with, in cases where the molecules are symmetrically equivalent, no great encumbrance of the end result.Keywords
This publication has 4 references indexed in Scilit:
- The external lattice vibrations of orthorhombic sulphurJournal of Raman Spectroscopy, 1974
- Constrained refinement of orthorhombic sulphurActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1972
- L'effet Raman et le pivotement des molécules dans les cristaux. Théorie générale et vérification expérimentale dans le cas du naphtalèneJournal de Physique et le Radium, 1941
- Theory of the vibrations of the sodium chloride latticePhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1940