Broken (image) DOE/Pacific Northwest National Laboratory Caption Neutron crystallography shows this iron catalyst gripping two hydrogen atoms (red spheres). This arrangement allows an uncommon dihydrogen bond to form between the hydrogen atoms (red dots). Credit PNNL/Liu et al 2014 Usage Restrictions Credit PNNL/Liu et al 2014 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.