Surface (IMAGE) Vienna University of Technology Caption Local pattern formation in oscillatory hydrogen oxidation on rhodium: a scanning photoelectron microscope (SPEM) was used to create a chemical map of the species on the catalyst surface (left). Spectroscopic data (XPS) of the surface coverage enable to develop atomic models of the associated surface activity states (right). Credit TU Wien Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.