X-Ray Studies of Phase Transitions on Surfaces

Jens Aage Als-Nielsen

    Research output: Contribution to journalJournal articleResearchpeer-review


    The density variation across the surface from vapor to liquid in liquid crystal materials has been measured in the isotropic, nematic and smectic A phases by specular reflection of X rays with grazing angles from θc to θB (total reflection angle and Bragg angle for smectic A layering, respectively) using synchroton X-rays in HASYLAB, Hamburg. Crystalline surface structures may be deduced from X-ray diffraction, utilizing the evanescent beam occuring for grazing angles less than θc to obtain surface sensitivity. Results from the reconstruction of Au(110) surface are reviewed.
    Original languageEnglish
    JournalPhysica B: Condensed Matter
    Issue number1-3
    Pages (from-to)145-148
    Publication statusPublished - 1984


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