Dielectric theory of strained molecular crystals: Elasto-optic coefficients of orthorhombic sulphur

P. J. Bounds, R. W. Munn

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The general dielectric theory of molecular crystals is extended to calculate the strain derivatives of dielectric properties, assuming a fixed polarizability relative to the molecular axes. The molecular rotation due to strain makes an important contribution, for which an empirical prescription is given. To illustrate the theory, the elasto-optic coefficients for orthorhombic sulphur are calculated. They apree well with experiment when each sulphur atom is treated as a polarizable point. It is concluded that the polarizability can be treated as fixed, for example in deducing changes of molecular orientation from birefringence measurements through phase transitions.

    Original languageEnglish
    Pages (from-to)165-173
    Number of pages9
    JournalChemical Physics
    Volume39
    Issue number2
    DOIs
    Publication statusPublished - 1 Jun 1979

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