Influence of source coherence on X-ray absorption spectroscopy

Core-level x-ray absorption spectroscopy measurements have bean performed a t the L-3,L-2 edges of Fe and Co thin films. The degree of source coherence was varied using soft x rays from five different beam lines. We observe an increase of the L edge resonance intensities relative to the continuum sta tes which we propose is due to the presence of transverse coherence in the exciting radiation.