Trends in low energy electron microscopy

Altman, Michael S.

doi:10.1088/0953-8984/22/8/084017

Cited by 84 publications

(79 citation statements)

References 163 publications

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“…The LEED intensityvoltage (I -V ) curves were measured in a low-energy electron microscope operated in diffraction mode, corresponding to normal incidence. 17 The experimental data presented in Fig. 2 were obtained with the sample held at 83 K. Measurements that were carried out at 300 K produced almost identical results, except for strong suppression of diffraction intensities above about 150 eV due to the Debye-Waller effect.…”

Section: Methodsmentioning

confidence: 79%

C60on the Pt(111) surface: Structural tuning of electronic properties

et al. 2011

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The structure and electronic properties of the ( √ 13 × √ 13)R13.9 • and (2 √ 3 × 2 √ 3)R30 • ordered phases of C 60 on the Pt(111) surface are investigated using combined dynamic low-energy electron diffraction and density functional theory (DFT) calculations. The two phases have the same local adsorption structure, while they are predicted by DFT calculations to exhibit very different electronic structures due to their different inter-C 60 orientations and distances. This result demonstrates the structural tuning of electronic properties for molecular films or junctions composed of the same materials.

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Section: Methodsmentioning

confidence: 79%

C60on the Pt(111) surface: Structural tuning of electronic properties

et al. 2011

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“…In this mode, image contrast is sensitive to surface defects and changes in work function. [19,20] After Ar-ion sputtering, the surface is featureless except for a low density of defects as seen in Fig. 1(a).…”

Section: Methodsmentioning

confidence: 99%

On the rotational alignment of graphene domains grown on Ge(110) andGe(111)

et al. 2015

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We have used low-energy electron diffraction and microscopy to compare the growth of graphene on hydrogen-free Ge(111) and Ge(110) from an atomic carbon flux. Growth on Ge(110) leads to significantly better rotational alignment of graphene domains with the substrate. To explain the poor rotational alignment on Ge(111), we have investigated experimentally and theoretically how the adatom reconstructions of Ge interact with graphene. We find that the ordering transition of the Ge(111) adatom reconstruction is not significantly perturbed by graphene. Density functional theory calculations show that graphene on reconstructed Ge(110) has large-amplitude corrugations, whereas it is remarkably flat on reconstructed Ge(111). We argue that the absence of corrugations prevents graphene islands from locking into a preferred orientation.

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“…LEED measurements of the ͑00͒ beam at normal incidence, corresponding to no momentum transfer parallel to the surface, were performed in a low-energy electron microscope ͑LEEM͒. 24,25 These new LEED data are presented here in comparison to results of LEEM-image intensity measurements that were obtained previously for the same diffraction condition ͓Fig. 1͑a͔͒.…”

Section: A Experimental Detailsmentioning

confidence: 96%

Quantum size effect driven thermal decomposition of Ag films on Fe(100) in the presence of pinhole-growth morphological defects

2010

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The growth morphology of Ag films that are deposited on an Fe͑100͒ surface at room temperature has been investigated using low-energy electron-diffraction spot-profile analysis and low-energy electron microscopy. The superposition of periodic spot-profile modulations that are caused by interference of waves that are reflected from the surface at different exposed levels and intensity oscillations that are associated with quantum-well resonances within the film provides complementary information on film roughness and thickness. The predominant morphological defect that is present during layer-by-layer growth is determined to be pinholes that penetrate completely through the film to the Fe substrate surface. Such imperfect films are observed to decompose upon annealing to thicknesses that are stabilized by quantum-well states. This result suggests that pinholes eliminate kinetic limitations that promote the unusual bifurcation mode of thermal decomposition that was observed previously for atomically smooth films prepared at low temperature.

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Trends in low energy electron microscopy

Cited by 84 publications

References 163 publications

C60on the Pt(111) surface: Structural tuning of electronic properties

C60on the Pt(111) surface: Structural tuning of electronic properties

On the rotational alignment of graphene domains grown on Ge(110) andGe(111)

Quantum size effect driven thermal decomposition of Ag films on Fe(100) in the presence of pinhole-growth morphological defects

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