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oe1(光电查) - 科学论文

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  • Arrays of dark optical traps on a toroidal surface

    摘要： We have theoretically constructed light fields that can generate optical potentials representing rectangular arrays of dark optical traps on the surface of a torus. The arrays are not diffraction limited, and their period can in principle be deeply subwavelength. We discuss the challenges anticipated in realizing such potentials, which will be of great interest for quantum simulations.

    关键词： vortex lines,quantum simulations,optical traps,toroidal surface,subwavelength

    更新于2025-09-19 17:15:36

  • Sensitive X-ray Absorption Near Edge Structure Analysis on the Bonding Properties of Au <sub/>30</sub> (SR) <sub/>18</sub> Nanoclusters

    摘要： Au nanoclusters (NCs) with organothiolate protecting ligands are a field of great interest and X-ray absorption spectroscopy is a useful tool for the structure and property studies of these Au NCs. However, the Au NCs normally show broad and low-intensity features in the gold X-ray absorption near-edge structure (XANES) region, lowering the sensitivity of the technique and making it difficult to use for the analysis of Au NCs. In this work we report a sensitive gold L3-edge XANES study on the bonding properties of the newly discovered Au30(SR)18 NCs utilizing a combined approach of the first derivative XANES spectra and quantum simulations. First derivative XANES spectra are compared with the well-studied Au25(SR)18 with the aim of determining the unique features of Au30(SR)18. It is found that the early XANES region of the Au NCs is significantly influenced by the gold?gold bonding environment in the surface sites, as the varying surface Au?Au bond lengths in Au25(SR)18 and Au30(SR)18 result in pronounced difference in the first derivative XANES. These findings can be consistently explained using site-selective quantum simulations of the XANES spectra based on the Au NC structural models. The XANES method presented in this work offers a useful tool for the sensitive analysis on structure and bonding properties of Au NCs.

    关键词： Au nanoclusters,bonding properties,quantum simulations,XANES,X-ray absorption spectroscopy

    更新于2025-09-09 09:28:46