X-Ray Reflectivity from the Surface of a Liquid Crystal: Surface Structure and Absolute Value of Critical Fluctuations

P.S. Pershan, Jens Aage Als-Nielsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    X-ray reflectivity from the surface of a nematic liquid crystal is interpreted as the coherent superposition of Fresnel reflection from the surface and Bragg reflection from smectic order induced by the surface. Angular dependence of the Fresnel effect yields information on surface structure. Measurement of the intensity of diffuse critical scattering relative to the Fresnel reflection yields the absolute value of the critical part of the density-density correlation function.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume52
    Issue number9
    Pages (from-to)759-762
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1984

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