Mortensen, K.Chen, D. M.Bedrossian, P. J.Golovchenko, JeneBesenbacher, F.2016-11-181991Mortensen, K., D. M. Chen, P. J. Bedrossian, J. A. Golovchenko, and F. Besenbacher. 1991. Two Reaction Channels Directly Observed for Atomic Hydrogen on the Si(111)-7×7 Surface. Physical Review B 43, no. 2: 1816–1819. doi:10.1103/physrevb.43.1816.0163-1829http://nrs.harvard.edu/urn-3:HUL.InstRepos:29407032Using scanning tunneling microscopy and spectroscopy, we have investigated the reaction of atomic hydrogen with the Si(111)-7×7 reconstructed surface. A simple picture evolves in which the reaction proceeds concurrently along two channels: a direct binding of the hydrogen atoms to the existing dangling bonds of the surface, and a slower removal of the uppermost Si layer and binding of the hydrogen atoms to the created dangling bonds of the next layer.en-USJournal Article2016-11-1810.1103/PhysRevB.43.1816