Chevron Defect at the Intersection of Grain Boundaries with Free Surfaces in Au

Radetić, Tamara; Lançon, Frédéric; Dahmen, U.

doi:10.1103/physrevlett.89.085502

Cited by 40 publications

(32 citation statements)

References 24 publications

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“…2 we have a "missing row" 1 × 2 and 1 × 3 reconstruction of the 110 surface 15 . In Box B we have a chevron defect 16 . Box C contains a {111} straight edge.…”

Section: Phase Retrieval Resultsmentioning

confidence: 99%

“…The binding energies of atoms in the chevron defect are harder to estimate as the number of nearest neighbors and the inter-atomic distances vary from atom to atom. We would expect them to be bound with similar or less strength than the atoms on the missing row reconstruction 16 . The probability of ejecting an atom from the surface can be determined from the cross section of a relativistic electron scattered from a nucleus via the Coulomb interaction.…”

Section: Discussionmentioning

confidence: 99%

“…The binding of face-centered cubic metals is mediated by localized d-shell electrons and the repulsion of nearest neighbor ions, as modeled by a tight-binding second-moment approximation 17,18 . In particular, this has been used to study the properties of the chevron defect 16 . Using parameters fitted to the bulk properties of gold 18 the binding energies of atoms at different parts of our interface were estimated.…”

Section: Discussionmentioning

confidence: 99%

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Phase imaging and the evolution of a gold-vacuum interface at atomic resolution

et al. 2006

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“…2 we have a "missing row" 1 × 2 and 1 × 3 reconstruction of the 110 surface 15 . In Box B we have a chevron defect 16 . Box C contains a {111} straight edge.…”

Section: Phase Retrieval Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Phase imaging and the evolution of a gold-vacuum interface at atomic resolution

et al. 2006

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“…One particular inclination of this boundary is of special interest because it is characterized by a direction in which the two grains are incommensurate. The structure of this boundary has been investigated by highresolution microscopy (Penisson et al 1999;Radetic et al 2002), and atomistic simulations predict vanishing static friction for gliding along this direction (Lançon et al 2000). However, the ability to investigate the atomic structure has been limited by the S/N ratio of high-resolution images, the geometric constraints of the sample and the stability of samples under the influence of the electron beam.…”

Section: (D) Au Nanobridgesmentioning

confidence: 99%

Background, status and future of the Transmission Electron Aberration-corrected Microscope project

Dahmen

Erni

Radmilović

et al. 2009

Phil. Trans. R. Soc. A.

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The strong interaction of electrons with small volumes of matter make them an ideal probe for nanomaterials, but our ability to fully use this signal in electron microscopes remains limited by lens aberrations. To bring this unique advantage to bear on materials research requires a sample space for electron scattering experiments in a tunable electron-optical environment. This is the vision for the Transmission Electron Aberrationcorrected Microscope (TEAM) project, which was initiated as a collaborative effort to re-design the electron microscope around aberration-correcting optics. The resulting improvements in spatial, spectral and temporal resolution, the increased space around the sample and the possibility of exotic electron-optical settings will enable new types of experiments. This contribution will give an overview of the TEAM project and its current status, illustrate the performance of the TEAM 0.5 instrument, with highlights from early applications of the machine, and outline future scientific opportunities for aberration-corrected microscopy.Keywords: aberration correction; depth sectioning; monochromator; single-atom detection; light atom imaging; electron microscopy Overview of the Transmission Electron Aberration-corrected Microscope projectRecent advances in aberration-correcting electron optics have led to increased resolution, sensitivity and signal-to-noise (S/N) ratio in atomic resolution microscopy. These advances have created the opportunity to directly observe the atomic-scale order, electronic structure and dynamics of individual nanoscale objects by advanced transmission electron microscopy (TEM). To take advantage of this opportunity, the Transmission Electron Aberration-corrected Microscope (TEAM) project was initiated to optimize the electron microscope around aberration-corrected electron optics and to further advance the limits of the instrument and the technique. The project brings together several leading microscopy groups supported by the US Department of Energy's (DOE's) Office *Author for correspondence (udahmen@lbl.gov).One contribution of 14 to a Discussion Meeting Issue 'New possibilities with aberration-corrected electron microscopy'. http://www.science.doe.gov). After its completion, the instrument will be made available to the scientific user community at the National Center for Electron Microscopy (NCEM).The vision for the TEAM project is the idea of providing a sample space for electron scattering experiments in a tunable electron-optical environment by removing some of the constraints that have limited electron microscopy until now. The resulting improvements in spatial, spectral and temporal resolution, the increased space around the sample and the possibility of setting up novel electronoptical configurations will enable new types of experiments in electron scattering. The TEAM microscope will feature unique corrector elements for spherical and chromatic aberrations, a novel atomic-force-microscopy-inspired specimen stage, a high-brightness gun and numerous other in...

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“…Notably, these facets were observed to be the least mobile of the three, remaining stationary for long periods followed by erratic bursts of motion mediated by step nucleation and propagation. Other work suggests that the mobility of these facets depends strongly on interactions with free surfaces, as this particular interface can exhibit a chevron-like dissociation when it intersects a surface [16,17].…”

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confidence: 99%