Within various x-ray programs there exists a need for a detailed investigation of the surface roughness of mirrored surfaces over a wide spatial wavelength bandwidth, ranging from large scale figure error to micro roughness. A number of methods exist to measure the surface roughness. Common to all methods is that they are bandwidth-limited. A crucial point in the analysis of data is, therefore, to specify accurately the wavelength bandwidth limitation and to determine the surface autocorrelation function within this bandwidth. We present a number of scattering measurements obtained using a triple-axis perfect-crystal x-ray diffractometer and the results of an autocorrelation function analysis. Furthermore, we present some measurements of integrated reflectivity, which we believe provide evidence for microroughness in the range from a few angstroms to tens of microns.
© 1988 Optical Society of America
Finn E. Christensen, A. Hornstrup, and Herbert W. Schnopper, "Surface correlation function analysis of high resolution scattering data from mirrored surfaces obtained using a triple-axis x-ray diffractometer," Appl. Opt. 27, 1548-1557 (1988)