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- W2396605797 abstract "We present a systematic study of the hydrogen induced anomalous expansion of the top layer spacing, ${d}_{12}$, using low-energy electron diffraction and surface x-ray scattering. After exposure of 6 L of hydrogen at 150 K sample temperature, the hydrogen atoms fully occupy the surface hollow sites and a lattice expansion of $ensuremath{Delta}{d}_{12}=+4.7%$ is determined in agreement with theoretical predictions (5.2%). Heating the sample above the hydrogen desorption temperature $({T}_{D}ensuremath{approx}340phantom{rule{0.3em}{0ex}}mathrm{K})$, leads to an almost complete relaxation of ${d}_{12}$ to the bulk value of 1.945 AA{}. Similarly, no expansion is observed for clean Pd(001) prepared by rapid cooling after quick thermal treatment to remove hydrogen. Hydrogen re-adsorption from the residual gas atmosphere and possibly hydrogen agglomeration in the near surface region leads to an expansion of ${d}_{12}$ in the 2%--3% range as observed in previous experiments. On the basis of our results, surface magnetism as a mechanism to trigger lattice expansion in Pd(001) does not need to be invoked." @default.
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- W2396605797 date "2005-05-27" @default.
- W2396605797 modified "2023-10-13" @default.
- W2396605797 title "Origin of anomalous surface lattice expansion in Pd(001)" @default.
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- W2396605797 doi "https://doi.org/10.1103/physrevb.71.205418" @default.
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