Angular- and spatial-dependent intensity behaviour for a prototype laterally inhomogeneous sample studied with an ES200B spectrometer

An investigation into the surface area sampled in an ESCA experiment for a laterally inhomogeneous sample is described. The experiments use a special sample with gold “islands” in a polymeric matrix machined to the normal dimensions as encountered when using an ES200B spectrometer. The spatial distribution of the X-rays is not symmetrical about the anode and the effective area of acceptance into the analyzer changes with the electron take-off angle.