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
