Surface Diffusion of Hydrogen and Deuterium on NICKEL(100) and NICKEL(111) Investigated by Linear Optical Diffraction
A novel linear optical diffraction technique was developed and used to study the diffusion of hydrogen and deuterium atoms on Ni(100) and (111) surfaces. The technique is shown to be sensitive to <2% of a monolayer. Quantum tunneling diffusion was observed on both surfaces. On Ni(100), an activated tunneling behavior is observed which can be explained by the theory of small polarons. On Ni(111), a non-activated tunneling behavior is observed, which confirms previous observations made by Gomer and coworkers using a field emission microscope.
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- Physics: Condensed Matter