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1091-專題演講-1091104-莊子弘（同步輻射奈米科學）
演講活動
張貼人：李明芳 ╱ 公告日期：2020-08-18|
Time：1091104 (Wed.) 14:20~16:20
Speaker：Prof.莊子弘(CHUANG, Tzu-Hung)
國家同步輻射研究中心奈米科學小組/Nano Science Group, National Synchrotron Radiation Research Center
Title：Photoemission electron microscopy at Taiwan Light Source and Taiwan Photon Source
Abstract：The technical capabilities and scientific opportunities of both full-field X-ray photoemission electron microscopy (PEEM) end-stations at Taiwan Light Source (TLS) and Taiwan Photon Source (TPS) of NSRRC will be introduced. Several investigations for two-dimensional materials will be also discussed.
The Photoelectron Related Image and Nano-Spectroscopy (PRINS) end-station at the TPS 27A2 will host a photoelectron microscope that aims to work on photoelectron-related imaging and nano-scale spectroscopy through the combination of an imaging-type electron column integrated with a hemispherical electron energy analyzer and an imaging spin filter. The microscope is able to conduct full-field imaging by collecting photoelectrons in either real-space or momentum-space with spin contrast.
Taking advantage of an elliptically polarized undulator (EPU) photon source, i.e. the energy and polarization of the X-rays are both tunable, and powering by an in-house designed active-mirror plane grating monochromator, which delivers soft X-rays in a range of 90-3000 eV, the PRINS microscope has multiple capabilities, such as (1) X-ray absorption spectroscopy (XAS)-based and X-ray magnetic circular dichroism (XMCD)-based real-space imaging to obtain element-resolved mapping or spin-texture information, (2) X-ray photoelectron spectroscopy (XPS)-based real- and momentum-space imaging to obtain spatially-resolved chemical state mapping and band-structure imaging, (3) spin-resolved band structure measurement when the imaging spin filter is introduced, and (4) micro-area spectroscopy (XAS, XPS, and angle-resolved photoelectron spectroscopy) extracted from a series of images measured at different kinetic energies of the electrons.
The photoelectron microscope system including a hexapod sample manipulator, imaging spin filter, and ultraviolet light sources (mercury and helium) is expected to arrive at TPS before June 2021. A sample preparation chamber with standard surface science characterization capabilities, including the ion sputtering, low energy electron diffraction, Auger electron spectroscopy, and electron-assisted thin-film deposition, will be connected to the main photoelectron microscope system to enable in-situ experiments. The sample preparation system will be initiated and tested at the beginning of 2021. Technical capabilities and scientific opportunities of the end-station will be discussed in the talk, and the current status will also be reported.
Place：B101, Gongquan Campuses, NTNU
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最後修改時間：2020-11-02 PM 3:48
