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Beamlines in 2020

  UVSOR is one of the highest-brilliance light sources in the extreme-ultraviolet region among the synchrotron radiation facilities with electron energies of less than 1 GeV. The natural emittance of the UVSOR-III storage ring is as low as 17.5 nm-rad after the successful completion of the storage ring upgrade project (the UVSOR-III project) in 2012.
  Eight bending magnets and six insertion devices are available as synchrotron light sources at UVSOR. As of 2018 there are a total of fourteen operational beamlines, which are classified into two categories. Twelve of them are the so-called “Open beamlines”, which are open to scientists from universities and research institutes belonging to the government, public organizations, private enterprises and also those from foreign countries. The remaining two beamlines are the “In-house beamlines”, and are dedicated to the use of research groups within Institute for Molecular Science (IMS).
  There is one soft X-ray station equipped with a double-crystal monochromator, seven extreme ultraviolet and soft X-ray stations with grazing incidence monochromators, three vacuum ultraviolet (VUV) stations with normal incidence monochromators, two infrared (IR) stations equipped with Fourier- Transform interferometers, and one direct radiation station located after two tandem undulators, as shown in the appended table (next page) for all available beamlines at UVSOR in 2020. The details of the updates for several beamlines are the followings.
  A new associate professor, Yoshitaka Taira, was appointed in April 2020. He is in charge of BL1U. In BL1U, the development of a new light source and the utilization of gamma-rays is being carried out. Gammaray induced positron annihilation spectroscopy, which can analyze nanometer scale defects in bulk materials, is provided to users. Array detectors using eight BaF2 scintillators were developed to increase the count rate of annihilation gamma-rays. The measurement can be completed in a few hours for metals.
  BL4U, which is equipped with a scanning transmission soft X-ray microscope (STXM), is actively used not only by academic users but also by many industrial users. In FY2020, it became possible to image the lithium K-edge with a spatial resolution of 72 nm. Final adjustments for the airtight sample transport system and the sample transport container are being carried out in preparation for the organic substance analysis of the Hayabusa2 returned samples scheduled for the summer of FY2021.
  At BL6U, one of the in-house beamlines, photoelectron momentum microscope (PMM), which is a new highefficiency electronic structure measurement system with high resolution in real space and momentum space, has been installed and is in operation. Experiments such as valence band photoelectron spectroscopy on the micrometer scale and resonance photoelectron diffraction by soft X-ray excitation can be performed. In FY2020, resonant photoelectron spectroscopy of graphenes, hightemperature superconductors, dichalcogenides, and organic molecular adsorbates were conducted in collaboration with several groups.
  Next generation spectro-microscopy and microspectroscopy workshop, involving BL4U and 6U, was held on October 28-29, 2020
(https://sites.google.com/ims.ac.jp/ uvsor-ws2020/ home?authuser=0).
  In BL5U, high energy resolution angle-resolved photoemission spectroscopy (ARPES) is available. Users can now use so-called “deflector mapping” for all kinetic energies and lens modes by using the latest version of ARPES analyzer. A system that can deposit alkali metals such as potassium while the sample is still mounted on the manipulator at low temperatures has been installed. As part of the development of spinresolved ARPES, a two-dimensional image of the spinresolved spectrum of the Rashba splitting of gold (111) surface has been successfully obtained.
  Those wishing to use the open and in-house beamlines are recommended to contact the appropriate beamline master (see next page). Applications can be submitted at NOUS (https:// nous.nins.jp/user/signin). All users are required to refer to the beamline manuals and the UVSOR guidebook, on the occasion of conducting the actual experimental procedures. For updated information on UVSOR, please see http://www. uvsor.ims.ac.jp


UVSOR Synchrotron Facility, Institute for Molecular Science
Yoshitaka TAIRA

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