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oe1(光电查) - 科学论文

4 条数据
?? 中文（中国） ▾

  • Structure determination of substrate influenced silicon nano-ribbon growth

    摘要： Using photoelectron diffraction (XPD), photoelectron spectroscopy (XPS), and low energy electron diffraction (LEED), we investigate the structure of silicon nano-ribbons grown on Au(1 1 0). We find that silicon forms two zigzag-terminated hexagonal chains along the [1 1 0]-substrate direction, while the gold substrate forms a bulk-typed surface reconstruction after silicon evaporation. Only two missing rows along the [1 1 0]-direction remain partially in their original structure at the Si/Au interface. Unlike silicon nano-ribbon formation on Ag(1 1 0), nano-ribbon growth on Au(1 1 0) is strongly substrate influenced by Van-der-Waals interaction and by AuSi bonding formation. This strong interaction leads to a substrate-driven hexagon formation, where the gold atoms are partially integrated into the ribbon structure. Besides the determination of the internal silicon nano-ribbon structure, we identify the origin of the two chemically shifted silicon components in the XPS spectra by deconvolving the diffraction pattern.

    关键词： Photoelectron spectroscopy,Hexagonal chains,Nano-ribbon,Silicon,Photoelectron diffraction

    更新于2025-09-23 15:21:01

  • Decoding the structure of interfaces and impurities in 2D materials by photoelectron holography

    摘要： The properties of atomically thin materials essentially depend on their structures, including impurities, defects and interfaces with underlying substrates. Thus, the detailed structural information is relevant for creation of 2D materials with desired properties. Here, we explore the capabilities of photoelectron diffraction and holography for structural analysis of atomically thin layers using as examples such systems as h-BN, graphene, and modified graphene with boron impurities. We show that for planar 2D crystals with commensurate interface to the substrate, it is possible to visualize the interface and impurities with high spatial resolution, and to distinguish possible non-equivalent structural units. Our approach applied to B-doped graphene on Ni(1 1 1) and Co(0 0 0 1) surfaces has allowed to reveal asymmetry of boron concentrations in the two carbon sublattices and established its dependence on the applied synthesis procedure and chosen substrate. The obtained results suggest that such approach can be widely applied for studies of various 2D systems, where the structures of interfaces and defects are of remarkable importance.

    关键词： doping,structure,photoelectron diffraction,graphene,hexagonal boron nitride,photoelectron holography

    更新于2025-09-19 17:13:59

  • Site-sensitive X-ray photoelectron spectroscopy of Fe <sub/>3</sub> O <sub/>4</sub> by photoelectron diffraction

    摘要： Fe 2p core-level photoelectron spectra of magnetite were measured using soft X-ray and hard X-ray, and its emission angle dependence was investigated. The photoelectron diffraction pattern from different atomic sites differs because the atomic arrangement surrounding each site is different. By selecting the forward-focusing-peak (FFP) directions characteristic to each atomic site and measuring the kinetic energy dependence of the FFP intensities at the Fe 2p core-level range, we succeed in detecting the variation of the peak intensity of Fe 2p core-level spectra at different emission directions. This result, consistent with recent results, suggests that the lower-binding-energy peak of the Fe 2p core-level spectrum may be assigned as the B site component.

    关键词： photoelectron diffraction,magnetic materials,mixed valence

    更新于2025-09-10 09:29:36

  • Reference Module in Materials Science and Materials Engineering || Photoelectron Diffraction

    摘要： Surface structural information can be derived from a great variety of methods, but most quantitative data are based on elastic scattering of X-rays, electrons, or ions by the near-surface atoms. While the best-known methods based on electron (and X-ray) scattering are conventional diffraction methods, reliant on long-range order, the technique of photoelectron diffraction is a local scattering technique that thus provides local structural information not dependent on long-range periodicity. In this short article the physical principles of photoelectron diffraction are described, highlighting at least two fundamentally distinct versions of the technique. The main areas of utilization of the method are illustrated.

    关键词： local scattering technique,long-range order,surface structural information,photoelectron diffraction,X-rays,electrons,elastic scattering,ions

    更新于2025-09-04 15:30:14