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• W2094048546 abstract "Temperature-programmed desorption (TPD) and scanning tunneling microscopy (STM) were used to probe the atomic arrangement on clean Ge(011)-c(8×10), as well as the desorption kinetics and pathways from hydrogen-adsorbed surfaces. For the TPD measurements, the samples were heated at 2°C s−1 after adsorbing atomic deuterium at 100°C to coverages θD ranging up to saturation. Low-energy electron diffraction (LEED) and STM show that saturation deuterium coverage results in a (1×1) structure with the surface composed of randomly distributed adatom islands. TPD spectra exhibit three second-order peaks corresponding to D2 desorption from multideuterides, adatom monodeuterides and rest-atom monodeuterides. Desorption from the multideuteride phase (with an activation energy Ea of 1.61 eV) begins at 200°C and, by 270°C, only the D–adatom and D–rest-atom monodeuteride phases remain. D2 begins to desorb from adatom sites (Ea=1.76 eV) above 230°C and from rest-atom sites (Ea=1.83 eV) above 240°C. From quantitative analyses of the TPD spectra, the adatom density on the clean surface is ≥0.47. This high adatom density — similar to that of Si(111)-(7×7), Si(011)-(16×2) and Ge(111)-c(2×8), all of which contain adatoms and rest atoms as primary building blocks — appears to rule out previously proposed models for the Ge(011)-c(8×10) surface structure, for which the adatom density is 0.064." @default.
• W2094048546 created "2016-06-24" @default.
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• W2094048546 date "2000-06-01" @default.
• W2094048546 modified "2023-09-26" @default.
• W2094048546 title "Ge(011)-c(8×10) surface structure and hydrogen desorption pathways: a temperature-programmed desorption and scanning tunneling microscopy study" @default.
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• W2094048546 doi "https://doi.org/10.1016/s0039-6028(00)00386-1" @default.
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