Der Guttmann'sche Kugelthurm als Reactions‐ und Absorptionsthurm

Heinz, Rudolf

doi:10.1002/ange.19010140806

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“…Because hydrogen is a very weak scatterer with a scattering cross section roughly two orders of magnitude smaller than transition metals like Ni, it is tempting to attribute these very weak fractional beam intensities to hydrogen superstructures. Up to this time, however, for all systems studied with LEED, the intensity in the fractional order beams could always be explained with slight changes in the positions of the substrate atoms rather than with hydrogen superstructures [28,29]. This includes the Ni(111)-(2×2)-2H system where originally a hydrogen superstructure was identified [18], but a reanalysis has found that in fact slight substrate modification was necessary to reproduce the fractional order beams.…”

Section: A Surface Structurementioning

confidence: 99%

Static and dynamic lattice changes induced by hydrogen adsorption on NiAl(110)

2003

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Static and dynamic changes induced by adsorption of atomic hydrogen on the NiAl(110) lattice at 130 K have been examined as a function of adsorbate coverage.Adsorbed hydrogen exists in three distinct phases. At low coverages the hydrogen is itinerant because of quantum tunneling between sites and exhibits no observable vibrational modes. Between 0.4 ML and 0.6 ML, substrate mediated interactions produce an ordered superstructure with c(2×2) symmetry, and at higher coverages, hydrogen exists as a disordered lattice gas. This picture of how hydrogen interacts with NiAl(110) is developed from our data and compared to current theoretical predictions.

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Section: A Surface Structurementioning

confidence: 99%