X-ray photoelectron diffraction and low-energy electron diffraction study of the interaction of oxygen with the Ni(001) surface: c(2 × 2) to saturated oxide

Saiki, R.S.; Kaduwela, A. P.; Sagurton, M.; Osterwalder, J.; Friedman, D. J.; Fadley, C. S.; Brundle, C. R.

doi:10.1016/0039-6028(93)90608-m

Cited by 79 publications

(20 citation statements)

References 45 publications

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“…For each calculated pattern, we report the values of two different R factors: R is obtained by a combination of five different R factors, as described in Ref. 25, R P is the more familiar Pendry R factor. 26 The calculation for the 1-ML fcc cluster, fcc site ͓Fig.…”

Section: Low Coveragementioning

confidence: 99%

Structural transition in Fe ultrathin epitaxial films grown on Ni(111)

et al. 2002

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A structural study of Fe ultrathin epitaxial films, grown at room temperature on Ni͑111͒, has been performed in the 1.5-18 ML coverage range by angle-scanned photoelectron diffraction. Both backscattering and forward-scattering energy regimes have been employed, in order to enhance the structural sensitivity at lower and higher film thicknesses, respectively. Modeling of the experimental data has been performed with multiple scattering calculations. We found indications that Fe atoms in the first layer occupy fcc hollow sites and stack with a pseudomorphic fcc structure up to 2 ML. Concerning the growth mode at these early stages, data suggest that a good substrate wetting and a sharp Fe/Ni interface take place. Between 3 and 6 ML, transition to a bcc͑110͒ phase develops. By quantitative R-factor analysis, we found that Nishiyama-Wassermann ͑NW͒ in-plane orientation of the bcc͑110͒ cell (͗001͘ bcc ʈ ͗11 0͘ fcc ) is favored over the Kurdjumov-Sachs (͗11 1͘ bcc ʈ ͗11 0͘ fcc ) orientation. The best-fit vertical interlayer distance between bcc͑110͒ planes is d NW ϭ2.11 Å ͑ϩ3.9% expansion͒ at 6 ML and relaxes to d NW ϭ2.05 Å ͑ϩ1.0%͒ at 18 ML, in agreement with the angular shift observed for the forward-focusing features. In the same coverage range, the angle between bcc͑110͒ surface basis vectors changes from 67.7°to 69.0°, corresponding to Ϫ1.7% and Ϫ1.0% contractions of the surface cell area, respectively.

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Section: Low Coveragementioning

confidence: 99%

Structural transition in Fe ultrathin epitaxial films grown on Ni(111)

et al. 2002

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“…anisotropy in the real crystal due to defects ͑roughness, coverage, and disorder͒ surrounding the emitting atom. 18 The results of a first comparison with the experimental data are reported in Table I where the R-factor values are reported, as well as the scaling factors for each simulated model. As the visual comparison points out, the best agreement for the annealed system is obtained with the S 9 , S 8 , and I 2 models, while H 3 , S 7 , and the Mn 5 Ge 3 models yield larger R factors, and T 4 , S 5 , and I 1 have an R factor always equal or greater than one.…”

Section: B Comparison To the Modelsmentioning

confidence: 99%

Local coordination of Mn atoms at the Mn:Ge(111) interface from photoelectron diffraction experiments

et al. 2008

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X-ray photoelectron diffraction (PED) experiment on the metallic Mn:Ge(111) surface alloy has been carried out in the initial stage of mixed phase growth. Our findings show that the Mn(5)Ge(3) phase is not yet formed for a 1.3 ML (monolayer) coverage, as well as for a 2 ML coverage, followed by an annealing at temperature (similar to 300 degrees C). Rather, we observed the formation of an ordered surface alloy by Mn occupation of the hollow H(3) sites in the topmost layer, while about 10% of Mn atoms are found in subsurface layers, partially confirming the theoretical expectations by Zhu [Phys. Rev. Lett. 93, 126102 (2004)]. However, the contribution to PED patterns from subsurface Mn atoms is found compatible with the occupation of interstitial sites only for the 1.3 ML coverage and with the occupation of both interstitial and unexpected substitutional sites for the 2 ML coverage. These findings thus open questions about the determination of the kinetic path to Mn subsurface migration in diluted alloys

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“…In order to compare experimental and theoretical results the R-factor (R 2 ) introduced by Saiki et al [34] in the form…”

Section: Multiple-scattering Cluster Modelmentioning

confidence: 99%

Growth and structure of thin MnO films on Ag(001) in dependence on film thickness

et al. 2008

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X-ray photoelectron diffraction and low-energy electron diffraction study of the interaction of oxygen with the Ni(001) surface: c(2 × 2) to saturated oxide

Cited by 79 publications

References 45 publications

Structural transition in Fe ultrathin epitaxial films grown on Ni(111)

Structural transition in Fe ultrathin epitaxial films grown on Ni(111)

Local coordination of Mn atoms at the Mn:Ge(111) interface from photoelectron diffraction experiments

Growth and structure of thin MnO films on Ag(001) in dependence on film thickness

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