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Bahn, Emanuel
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Publications (4/4 displayed)
- 2016Ballistic Diffusion in Polyaromatic Hydrocarbons on Graphitecitations
- 2016Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surfacecitations
- 2014The structure of deuterated benzene films adsorbed on the graphite (0001) basal plane: what happens below and above the monolayer coverage?citations
- 2014The structure of deuterated benzene films adsorbed on the graphite (0001) basal plane: what happens below and above the monolayer coverage?citations
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article
Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface
Abstract
Using helium-3 atom scattering, we have studied the adsorption kinetics, the structure and the diffusional dynamics of atomic hydrogen on the surface of a graphene monolayer on Ni(111). Diffraction measurements reveal a 4° rotated rectangular hydrogen overstructure. Hydrogen adsorption and desorption exhibit activation barriers of Ea = ( 89 ± 7 ) meV and Ed = ( 1.8 ± 0.2 ) eV, respectively. Helium-3 spin-echo measurements showed no decay of the spatial correlation function (or intermediate scattering function) within the time range of the spectrometer. Hence, we are able to set lower limits for a possible hydrogen surface diffusion rate.