AN X-RAY-SCATTERING STUDY OF LATERALLY MODULATED STRUCTURES - THE EXAMPLE OF DIBLOCK COPOLYMERS

A study of the specular and off-specular (diffuse) x-ray scattering of a diblock copolymer is presented. In the ordered state the surface of the diblock copolymer is covered with islands. It is shown that the p eriodicity in the ordered state in the direction normal to the surface in a specular scan differs from the periodicity in the same direction observed in an off-specular scan. This result is explained by an anal ytical calculation of the differential cross section. The introduction of the statistical properties of the island distribution allows a com plete analytical calculation of the transverse scans yielding the dete rmination of the mean distance between the islands and the average siz e of an island.