1. STM of RE complex_16x9 (IMAGE) DOE/Argonne National Laboratory Caption Scanning tunneling microscopy (STM) image of a rotating europium (Eu) complex on a gold sheet. The dark spot in disc indicates the single Eu atom. Credit (Image by Argonne National Laboratory.) Usage Restrictions Original content 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.