2 REACTION CHANNELS DIRECTLY OBSERVED FOR ATOMIC-HYDROGEN ON THE SI(111)-7X7 SURFACE

[摘要] Using scanning tunneling microscopy and spectroscopy, we have investigated the reaction of atomic hydrogen with the Si(111)7x7 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.

[关键词] SCANNING-TUNNELING MICROSCOPY;ELECTRONIC-STRUCTURE;SILICON SURFACES;ADSORPTION;CHEMISORPTION;CHEMISTRY;KINETICS;STATES