Surface structure determination from ion scattering images

Kim, C.; Höfner, C.; Rabalais, J. W.

doi:10.1016/s0039-6028(97)00521-9

Cited by 13 publications

(5 citation statements)

References 14 publications

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“…Pt (111) surface has been widely investigated experimentally and is an 'anomalous' one too. The surface relaxation ranges from 0.0 to 1.5% [20,21,[41][42][43][44]. The EAM [13] and ECT [11] methods gave values of −2.1% and −2.69%, respectively.…”

Section: Surface Relaxationmentioning

confidence: 99%

Surface relaxation and stress of fcc metals: Cu, Ag, Au, Ni, Pd, Pt, Al and Pb

Wan

Fan

Gong

et al. 1999

Modelling Simul. Mater. Sci. Eng.

142

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The multilayer relaxation at (100), (110), (111), (210), (211), (310), (311) and (331) surfaces of the fcc metals Cu, Ag, Au, Ni, Pd, Pt, Al and Pb are calculated using the modified embedded atom method. The 'anomalous' outward relaxation at Al (100), (111), Pt (111), and Cu (111) surfaces is described correctly. The relief of surface stress and tension on the relaxation is studied on (111), (100) and (110) surfaces. In general, the surface stress in the direction of the surface normal determines the relaxation direction except for the Al (110) surface. When the surface stress is negative, the surface relaxation is inward; otherwise, the relaxation is outward. An interesting result is that the surface tension does not always decrease after relaxation. The outward relaxation will induce the increase in surface tension while the inward relaxation induces the decrease in surface tension.

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Section: Surface Relaxationmentioning

confidence: 99%

Surface relaxation and stress of fcc metals: Cu, Ag, Au, Ni, Pd, Pt, Al and Pb

Wan

Fan

Gong

et al. 1999

Modelling Simul. Mater. Sci. Eng.

142

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show abstract

“…The agreement between these simulated and experimental images is quantified by 2-D reliability analysis (24). Quantitative differences, or R-factors, characterize the reliability between the images, with the minimum R-factor corresponding to the best agreement.…”

Section: E El Le Em Me En Nt T--s Sp Pe Ec CI If Fi Ic C I Im Ma Ag Gmentioning

confidence: 99%

“…SARIS has been used to measure the first-and second-layer spacing in a Pt(111) surface (24). The structural parameters were varied until a minimum R-factor was obtained, which occurred for the bulk-truncated Pt(111) structure.…”

Section: E El Le Em Me En Nt T--s Sp Pe Ec CI If Fi Ic C I Im Ma Ag Gmentioning

confidence: 99%

Peer Reviewed: Imaging Spectrometry from Nature’s Own Atomic Lenses

Rabalais¹

2001

Anal. Chem.

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“…Our studies have shown that SARIC provides interpretations of the scattering and recoiling patterns in terms of the ion trajectories responsible for the specific features. A two-dimensional reliability ( R ) factor has been developed for the quantitative comparison of experimental and simulated images. Details of the code are described elsewhere. , …”

Section: Experiments and Simulationsmentioning

confidence: 99%

“…The arrangement of the first-layer atoms is identical along both of these azimuths; however, the second-and third-layer atoms have a different arrangement with respect to the first-layer atoms, as shown in Figure 11a. He atoms scattered from second-and third-layer Quantitative analyses can be achieved by using the SARIC simulation and minimization of the R factor 32 between the experimental and simulated images as a function of the structural parameters. SARIC was used to generate simulated images of 4 keV He + scattering from bulk-terminated Pt{111} as a function of the first-second interlayer spacing d. Isotropic thermal vibrations with an amplitude of 0.1 Å were included in the model.…”

Section: Quantative Analysis Of the Pt{111} Surfacementioning

confidence: 99%

Real-Space Surface Crystallography from Ion Scattering

2000

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Ion beams in the kiloelectronvolt energy range impinging on crystal surfaces are atomic-size probes of the nanoscale magnifying and focusing "lenses" formed by the periodic structures. These lenses disperse the scattered and recoiled atom trajectories into macroscopic projections according to their velocities as a function of projectile/target atom masses and deflection angles. The resulting patterns reflect the near-surface interatomic vectors. The spatially and temporally resolved images of these patterns can now be acquired by means of new developments in ion scattering spectrometry, providing direct, element-specific, real-space projections of surface structure. The resulting scattering and recoiling imaging spectrometry (SARIS) provides unique capabilities for analyzing surface composition and structure and for investigating the interactions of ions with surfaces. A classical ion trajectory program called scattering and recoiling imaging code (SARIC) that simulates the spatial and time intensity distributions of the SARIS images has been developed. A quantitative comparison of experimental and simulated images is achieved by means of a two-dimensional reliability (R) factor. Examples of applications include experimental stereographic projections of the Ni(110) and Pt(111) surfaces, the termination layer of the CdS(0001) surface, the chemisorption of Cl 2 on Ni(110) and H 2 on Pt(111), and the atomic lenses in the Pt(111) surface.

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Surface structure determination from ion scattering images

Cited by 13 publications

References 14 publications

Surface relaxation and stress of fcc metals: Cu, Ag, Au, Ni, Pd, Pt, Al and Pb

Surface relaxation and stress of fcc metals: Cu, Ag, Au, Ni, Pd, Pt, Al and Pb

Peer Reviewed: Imaging Spectrometry from Nature’s Own Atomic Lenses

Real-Space Surface Crystallography from Ion Scattering

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