(IMAGE) Technical University of Munich (TUM) Caption Crystal structure of alpha-F2, which is stable below 45.6 K. It crystallizes in the monoclinic space group C2/c with F-F- bond lengths of 140.4 pm. Credit F. Kraus / M. Hoelzel 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.