Patent ID: 6430256
Filing Date: 2002-08-06
Classification: G01N

Abstract:
An x-ray method for the determination of the structure of systems that have two-dimensional periodicity and are positionally correlated with an underlying substrate crystal comprising the following steps:creating two overlapping x-ray beams in said system having said two-dimensional periodicity such that said overlapping beams propagate at an angle with respect to each other and their orientation relative to said two-dimensional system is such that the diffracted beams interfere with each other; measuring the diffraction intensity and diffraction interference patterns; determining the phase derivative of the total complex scattering factor (CSF) along the Bragg rods using the diffraction interference patterns; determining the CSF along the Bragg rods from the measured diffraction intensity, the phase derivative of the total CSF, and the CSF of the known system; determining the electron-density function of the layer structure of said system by Fourier transforming the CSF along one Bragg rod; performing a three-dimensional Fourier back-Transform into real space to provide the three-dimensional real space x-ray dielectric function; and determining the three-dimensional spatial structure, of said system having two-dimensional periodicity from said three-dimensional x-ray dielectric function.