27 March 2009
Vol 323, Issue 5922

About The Cover

Cover image expansion

COVER False-color, aberration-corrected transmission electron microscope image of a suspended single atomic layer of graphene. When an electron beam induces ejection of an atom from the edge of an intentionally made ~3-nm hole (black), the hole enlarges; the remaining edge carbon atoms rearrange from perfect hexagons into predicted metastable configurations. See page 1705. Image: Zettl Research Group and National Center for Electron Microscopy, Lawrence Berkeley National Laboratory; 3D visualization via WSxM software