Article ID Journal Published Year Pages File Type
9786051 Optics Communications 2005 14 Pages PDF
Abstract
In X-ray photon correlation spectroscopy (XPCS) the degree of coherence of the X-ray beam determines the contrast of the observed intensity correlation function. In this article, we present XPCS measurements of smectic liquid crystal membranes in a reflectivity geometry showing that both coherence and resolution can influence the time dependence of the correlation function. Variation of the pre-detector slits as well as of the projected coherence length on the membrane induce a time dependence of the intensity correlation function. We also treat several practical aspects and limitations we encountered during our XPCS studies. Finally the conditions for heterodyne detection at the specular ridge and homodyne detection at off-specular conditions are discussed.
Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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