Accelerators and Beamlines of UVSOR-III
The UVSOR-III is composed of three
accelerators: a 15 MeV linear
accelerator for electron injection, abooster synchrotron for accelerationof the electron beam up to 0.75 GeV,
and a 0.75 GeV electron storage ring,
53 m in circumstance. Synchrotron
light is produced from 8 pairs ofbending magnets and 6 units ofundulators.

Experimental Stations on UVSOR-III

U5
U6Variable Polarization Undulator

U4

In vacuum Undulator
In vacuum Undulator
Electron beamfrom 0.75 Gevbooster synchrotron

In vacuum Undulator

Variable Polarization Undulator

U3U7[BL4U] Scanning Transmission X-ray
Microscope (STXM)

Variable Polarization Undulator…

Bending magnet…

multi- pole magnet…
…

Steering magnet
Synchrotron light

Variable Polarization Undulator

Harmonic Cavity

The STXM focuses X-rays onto a sample as a ~30 nm spot
size and measures the intensity of the transmitted X-rays. Bychanging the energy of the X-rays, 2-dimensional chemical
state mapping with high spatial resolution can be obtained.
Samples in atmospheric or wet conditions can also be observed.

U1

High Frequency Cavity[BL3U] In Situ Soft X-ray Absorption
Spectroscopy of Liquid Samples

U3 In-Vacuum Undulator

U6 In-VacuumUndulator

Injector

U5 Undulator Circular
U5 Undulator Planer

Electron beams are generated by a liear
accelerator and are accelerated by a booster
synchrotron, 26.6 m in circumstance. As thebeam current of the storage ring decreases,
the electrons are injected immediately tokeep the current almost constant. This iscalled top-up injection.

Bending magnet[BL4B] High Magnetic Field, Low Temperature
Soft X-ray Magnetic Circular Dichroism (XMCD)
Element speciﬁc magnetization in magnetic materials isobserved in a magnetic ﬁeld up to ±7 T at temperatures aslow as 5 K. Magnetic thin ﬁlms prepared in a connected
sample preparation chamber can be investigated under anultrahigh vacuum condition without the exposure to air.

[BL6U] Molecular High-Resolution Angle-Resolved
Photoelectron Spectrometer (HR ARPES)[BL7U] Role of Quantum and Surface-State Eﬀects
in the Bulk Fermi-Level Position of Ultrathin Bi Films[BL4U] Observation of Drug Uptake
into Human Skin

[BL1U] Developments and Applicationsof New Light Sources[BL6U] Realization of a Strained
Atomic Wire Superlattice[BL6U] Dissociation Dynamics ofCore Excited Molecules

An in operando observation system for electrochemical
reactions under the same scan rate as in cyclic
voltammetry (CV) (100 mV/s) by X-ray absorption
spectroscopy (XAS) with a potential modulation method
was developed successfully. The electrode potential of
100 mV/s at a ﬁxed photon energy, and soft X-ray
absorption coeﬃcients at diﬀerent potentials aremeasured at the same time. Figure shows thethree-dimensional plots of Fe L-edge XAS spectra forelectrochemical reaction of iron sulfate solutions at 100
mV/s. Change in valence of Fe ions during theelectrochemical reaction at the same scan rate as in CV
was obtained. electrochemical cell opens a possibility toreveal the local structures of electrolytes and electric
double layers in electric devices under in operandoconditions.
Reference: M. Nagasaka et al., Rev. Sci. Instrum. 85,104105 (2014).

The UVSOR-III can generate radiation from THz waves
to 4 keV soft X-rays from 8 bending magnets and VUVand <1 keV soft X-rays from 6 units of undulators. The
synchrotron light is guided to each unique experimental
equipment. Each beamline consists of a monochromator toselect the wavelength or photon energy and a focusing
mirrors to collimate and focus the light.

A scanning X-ray transmission microscope (STXM)
enables to analyze 2-dimensional chemical status withhigh spatial resolution about 30 nm. In this research,penetration of drug, dexamethasone, into human skin
was observed by using the STXM. Then, diﬀerence ofchemical structure between the human skin and thedexamethasone was used as a chemical label. As a result,dexamethasone distributes in the outermost horny
layers of skin, stratum corneum. By using the STXM,
2-dimensional chemical status of the various samples,such as living cells, nano-materials, star dusts and fuelcells, are also investigated.
Reference: K. Yamamoto et al., Anal. Chem. 87, 6173-6179(2015).

A superlattice of strained Au-Si atomic wires wassuccessfully fabricate on a Si surface. At a reduced
density of Au, a regular array of Au-Si wires inalternation with pristine Si nanoterraces was found.
nanoterraces imposed a strain on the neighboring Au-Siwires, which modiﬁed both the band structure ofmetallic chains and the magnetic property of spin chains.
This is an ultimate 1D version of a strained-layer
superlattice of semiconductors, deﬁning a direction
toward the ﬁne engineering of self-assembled
atomic-scale wires.
Reference: I. Song et al., ACS Nano 9, 10621-10627 (2015).

Undulator[BL5U] High-Resolution Spin-, Space-, and Angle-Resolved
Photoemission Spectroscopy (HR spin- and μ-ARPES)The electronic states of small and inhomogeneous materials
can be obtained by micro-focused VUV light. Spin-resolved
ARPES will be available soon.

High-resolution photon-energy and polarization-dependent
ARPES measurements were performed on ultrathin Bi(111) ﬁlms formed on Si(111). In addition to theextensively studied surface states (SSs), the edge of thebulk valence band was clearly measured by using
S-polarized light. Direct evidence was found that thisvalence band edge, which forms a hole pocket in thebulk Bi crystal, does not cross the Fermi level for the180 bilayers (BL) thick ﬁlm. This is consistent with thepredicted semimetal-to-semiconductor transition due tothe quantum-size eﬀect. However, it became metallic
again when the ﬁlm thickness was decreased below 30
BL. A plausible explanation is the size eﬀect of the SS,
which can modify the charge neutrality condition andcan change the bulk Fermi level.
Reference: T. Hirahara et al., Phys. Rev. Lett. 115, 106803(2015).

Apart from spin angular momentum associated withcircular polarization, photons can carry orbital angularmomentum. Such photon beam has been intensively
investigated in the visible wavelength range using lasers.
Recent years, it was predicted theoretically that helicalundulators could produce optical vortex in the UV andX-ray range. UVSOR BL1U is one of very few beamline
in the world which can provide diﬀraction limited
ultraviolet light. Using this high quality beam,experimental studies on the properties of the opticalvortex beam and its applications to material sciences arein progress.
Reference: S. Sasaki, J. Particle Acc. Soc. Jpn. 11(4), 221(2014).

When a molecule is irradiated by linearly polarized
monochromatic soft X-ray photons, photoelectrons are emitted
due to the photoelectric eﬀect. In order to record the angular
distributions of the photoelectrons, a new apparatus which isrotatable around the photon beam axis has been developed.

Beamlines

An undulator is a device with periodic
magnetic sequence. The device is inserted
into linear sections between the bending
magnets. 6 units of undulators are installedin the UVSOR-III storage ring. 3 units out of
the 6 are in-vacuum soft X-ray undulators,
where the magnets are in the vacuumchamber.

[BL3U] In Operando Observation of Electrochemical Reaction by
Soft X-ray Absorption Spectroscopy with Potential Modulation Method

This apparatus is used for in-situ/operando observation ofliquids, catalytic reactions, and electrochemical reactions. Localstructures around target atoms in liquid, such as hydration
structures, reaction intermediates, and electrode surfaces, areinvestigated by T-mode soft X-ray absorption.

U7 Undulator Planer
U7 Undulator Circular

Research Outputs from UVSOR-III[BL7U] High-Resolution Angle-Resolved
Photoemission Spectroscopy (HR ARPES)
High energy- and momentum-resolution ARPES is available
using low energy photons (6-40 eV). Measurements withextremely low energy photons (<10 eV) provide the bulk
electronic structure of solids.

A molecule consists of more than two atoms held
together by chemical bonds. The electron in themolecules can be classiﬁed into two categories: valence
and core electrons. While the valence electrons
participate in the formation of the chemical bonds, thecore electrons are localized to particular atoms and notinvolved in any chemical bonding. The core electron
excitation and subsequent Auger decay often result in
multiple bond-breaking, which is hardly seen in thevalence excitation. New experimental techniques canexplore the dissociation dynamics in core-excited orcore-ionized molecules.
Reference: Y. Hikosaka et al., Chem. Phys. Lett. 603, 46(2014).

A,B: Bending Line

Circular Polarized UV Free Electron Laser (FEL) [199-800 nm, ~1W]
UV Coherent High-Harmonic Generation from Laser (HHG)

BL1B

Terahertz Spectroscopy with Coherent Synchrotron Radiation (THz-CSR)[Martin-Puplett FT-FIR 0.5 ‒ 30 meV]

BL2A

Soft X-ray Absorption Spectroscopy (XAS)[Double Crystal 585 ‒ 4000 eV]

BL2BPhotoelectron Spectroscopy dedicated to Organic Solids (Molecular PES)
[18m Spherical Grating 23 ‒ 205 eV]

BL3U

In situ/operando Soft X-ray Absorption Spectroscopy (Molecular XAS)
[Varied-line-spacing (VLS) Plane Grating 60 ‒ 800 eV]

BL3B

Vacuum Ultraviolet Spectroscopy (VUV)[2.5m Oﬀ-plane Eagle-type Normal Incidence 1.7-31 eV]

BL4USoft X-ray Spectro-microscopy (STXM)[Varied-line-spacing Plane Grating 130 ‒ 770 eV]

BL4BSoft X-ray Absorption Spectroscopy (XAS, XMCD)[Varied-line-spacing Plane Grating 25 ‒ 1000 eV]

BL5U

High-Resolution Spin-, Space- and Angle-Resolved Photoemission(HR spin- and μ-ARPES) [VLS Plane Grating 20 ‒ 200 eV]

BL5B

VUV/Soft X-ray Spectrometer dedicated to Calibration of Optical
Elements and Detectors [Plane Grating 6 ‒ 600 eV]

BL6U

Molecular Angle-Resolved Photoemission Spectroscopy(Molecular ARPES) [Varied-line-spacing Plane Grating 30 ‒ 500 eV]

BL6BInfrared and Terahertz Spectroscopy (IR/FIR/THz)[Michelson FT-IR 4 meV ‒ 2.5 eV]

BL7UHigh-Resolution Angle-Resolved Photoemission Spectroscopy(HR ARPES) [10-m Normal Incidence 6 ‒ 40 eV]

BL7B

Vacuum Ultraviolet Spectroscopy (VUV)[3m Normal Incidence 1.2 ‒ 25 eV]

BL2A

BL3B

BL5B

BL7B

BL6B

City Hall Tomei HighwayRoute 1←NagoyaOkazaki I.C.

Toyohashi→

Fukiya Bridge N.

Okazaki Castle
Oto Rivere-beams Electron Injector/Storage Ring/Laser Compton gamma-rays
Green indicates beamlines open to public users.
Orange indicates beamlines dedicated to joint research with in-house members.

BL1B→ Toyota

BL1UHigashi-Okazaki←Nagoya

Meitetsu Line

Toyohashi→NIBB
Rokusho Shrine
NIPS

Administration OfficeMain Gate
Administration Office←
Kota and Gamagori

UVSOR Users

National Institutes of Natural Sciences
Institute for Molecular Science
UVSOR Synchrotron★Academic and Public UsersUVSOR Synchrotron belongs to the Institute for
Molecular Science (IMS), which is dedicated toacademic researches as one of the inter-university
national research institutes. IMS is open to the world.
Academic use of UVSOR Synchrotron is free ofcharge. Travel and local expenses for the registeredusers (even from abroad) are fully or partly coveredby IMS.
★Private Users : charged★Please check UVSOR for details.

UVSORSearchIMS

UVSOR

Myodaiji Lodge

Mishima Lodge
Okazaki Conference Center

Okazaki High School N.W.

National Institutes of Natural Sciences
To Osaka
NagoyaCentrairNagoya I.C.
Jingu-mae

HigashiOkazakiToyota JCT
Okazaki I.C.
To
M meieit
et Highwsu
Lin ayeToyohashi

To Tokyo
Shinkansen

National Institutes of Natural Sciences
Institute for Molecular Science
UVSOR Synchrotron
38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, JapanTEL:+81-564-55-7401 FAX:+81-564-54-7079
https://www.uvsor.ims.ac.jp/eng/index.html

July 2016

UVSOR Synchrotron

U: Undulator Line

Institute for Molecular Science
National Institutes of Natural Sciences

Beamlines and Stations on UVSOR-III

Synchrotron Radiation
Synchrotron radiation is a bright light with a wide
wavelength range including; the microwave, infraredrays, visible light, ultraviolet and vacuum ultraviolet rays,and soft and hard X-rays. It is highly directional, pulsed,
and polarized light, which is used for research in broadﬁelds, such as molecular science, solid-state physics,materials physics, life science, and planetary science.

Synchrotron radiation (SR)is emitted from high energy
electron beams which arebent by a strong magnetic
ﬁeld of a bending magnet.
This is called bending
radiation.

Semi-monochromatic and semicoherent
SR are emitted from high energy
electrons passing through a periodic
magnetic sequence with small gaps. The
wavelength and polarization are variableby controlling this sequence and gaps.
This is called undulator radiation.

UVSOR-I 1983, UVSOR-II 2003, UVSOR-III since 2012
The original UVSOR Synchrotron was constructed in 1983 for application to molecular scienceand for its promotion to the world. The UVSOR Synchrotron is a rather small (53 mcircumference) and low-energy (0.75 GeV) facility providing highly focused and bright IR, VUVand soft X-rays which intract strongly with materials. It serves as a powerful photon source toresearch the origin of chemical and physical phenomena, such as chemical reactivity,conductivity, and magnetism. During operation over 30 years, new technologies, such as
diﬀraction limit beam emittance and top up injection, have been strategically introduced by
two major upgrade projects from UVSOR-I to UVSOR-III. The performance level in the VUVand soft X-ray region is still one of the highest in the world, as a small and low-energy
synchrotron light source.