Abstract
Abstract The adsorption of hydrogen and deuterium on a Cu(100) single crystal has been investigated as a function of coverage using an atomic hydrogen doser. It was found that the Cu(100) surface undergoes a reconstruction into the rather rare p4g or pgg structure. The reconstruction took place only at the very highest coverage and it was found to be followed by an adsorption site change for some of the hydrogen from a hollow site into a bridge bonded site. The thermal desorption spectra revealed a memory effect, suggesting a strong mass transport or modulation of the surface during the reconstruction.
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