The X-ray vectorial effect revisited

Measurements of the linear polarisation dependence of the X-ray photocurren t from gold were made at the Daresbury Synchrotron Radiation Source using a novel rotating chamber and the tuneable linear polarisation of the undulat or beamline 5U.1. The overall energy range was 65-1000 eV. At a grazing ang le of 8 degrees, significant polarisation sensitivity was observed (modulat ion factor 0.02 < \M\ < 0.1) for energies between 65 and 150 eV; this polar isation dependence can be fully accounted for by differences in the s- and p-state Fresnel reflectivities for gold. (C) 2000 Elsevier Science B.V. All rights reserved.