Catalysis (IMAGE) Vienna University of Technology Caption From left to right: Favorites sites of oxygen: map of Rh oxidation, measured by Scanning Photoelectron Microscopy (SPEM); in situ Photoemission Electron Microscopy (PEEM) of catalytic hydrogen oxidation on Rh; activity map. Field of view 500 μm. Models: terrace- (light blue) and step- (blue) Rh atoms, oxidized Rh atoms (light red), O atoms (red). Credit TU WIen Usage Restrictions None License Licensed 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.