期刊
SCIENCE ADVANCES
卷 6, 期 3, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aay5849
关键词
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资金
- China Scholarship Council (CSC)
- Graphene Flagship
- DFG
- Ministry of Science, Research and the Arts (MWK) of Baden-Wurttemberg
- Engineering and Physical Sciences Research Council (EPSRC)
- EPSRC [EP/R024790/1] Funding Source: UKRI
Metallic bonds remain one of the most important and least understood of the chemical bonds. In this study, we generated Re-2 molecules in which the Re-Re core is unsupported by ligands. Real-time imaging of the atomic-scale dynamics of Re-2 adsorbed on a graphitic lattice allows direct measurement of Re-Re bond lengths for individual molecules that changes in discrete steps correlating with bond order from one to four. Direct imaging of the Re-Re bond breaking process reveals a new bonding state with the bond order less than one and a high-amplitude vibrational stretch, preceding the bond dissociation. The methodology, based on aberration-corrected transmission electron microscopy imaging, is shown to be a powerful analytical tool for the investigation of dynamics of metallic bonding at the atomic level.
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