A5042178633- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Accelerators and Free-Electron Lasers
- Advanced Electron Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Laser-Plasma Interactions and Diagnostics
- Atomic and Molecular Physics
- Crystallography and Radiation Phenomena
- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Advanced Surface Polishing Techniques
- Magnetic properties of thin films
- Advanced X-ray and CT Imaging
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Mass Spectrometry Techniques and Applications
- Advancements in Photolithography Techniques
- Transition Metal Oxide Nanomaterials
- Rare-earth and actinide compounds
- Advanced Measurement and Metrology Techniques
- Optical measurement and interference techniques
- ZnO doping and properties
- Particle accelerators and beam dynamics
- Spectroscopy and Quantum Chemical Studies
Japan Synchrotron Radiation Research Institute
2016-2025
SPring-8
2015-2025
Kyoto University
2009-2024
RIKEN
2010-2022
Japan Science and Technology Agency
2011-2020
Tohoku University
1990-2020
The University of Tokyo
2011-2020
High Energy Accelerator Research Organization
2011-2017
Paul Scherrer Institute
2016
Nitto RIKEN (Japan)
2010-2014
A beamline for the x-ray free electron laser (XFEL) of SPring-8 Angstrom Compact LAser (SACLA) provides hard pulses in range 4.5–19.5 keV. Its optical system an optics hutch delivers a pink beam below 15 keV with either two double-mirror systems or monochromatic double-crystal monochromator. These XFEL beams are used various types measurement at experimental stations, e.g. diffraction, coherent diffraction imaging, spectroscopy and pump-and-probe measurement. The stations consist hutches...
The 13th harmonic of a Ti:sapphire (Ti:S) laser in the plateau region was injected as seeding source to 250-MeV free-electron-laser (FEL) amplifier. When amplification conditions were fulfilled, strong enhancement radiation intensity by factor 650 observed. random and uncontrollable spikes, which appeared spectra Self-Amplified Spontaneous Emission (SASE) based FEL without source, found be suppressed drastically form narrow-band, single peak profile at 61.2 nm. properties seeded well...
A new soft X-ray beamline, BL07LSU, has been constructed at SPring-8 to perform advanced spectroscopy for materials science. The beamline is designed achieve high energy resolution (E/ΔE> 10000) and photon flux [>10(12) photons s(-1) (0.01% bandwidth)(-1)] in the range 250-2000 eV with controllable polarization. To realise this state-of-the-art performance, a novel segmented cross undulator was developed adopted as light source. details of source monochromator design are described. achieved...
We report a method for achieving advanced photon diagnostics of x-ray free-electron lasers (XFELs) under quasi-noninvasive condition by using beam-splitting scheme. Here, we used transmission grating to generate multiple branches beams. One the two primary diffracted (+1st-order) is utilized spectral measurement in dispersive scheme, while other (-1st-order) dedicated arrival timing between XFEL and optical laser pulses. The transmitted beam (0th-order) guided an experimental station. To...
The design and performance of a soft X-ray free-electron laser (FEL) beamline the SPring-8 Compact LAser (SACLA) are described. SASE Source test accelerator, prototype machine SACLA, was relocated to SACLA undulator hall for dedicated use FEL beamline. Since accelerator is operated independently main linac that drives two hard beamlines, it possible produce both simultaneously. pulse energy reached 110 µJ at wavelength 12.4 nm (i.e. photon 100 eV) with an electron beam 780 MeV.
The main components of a new beamline for surface and interface crystal structure determination at SPring-8 are briefly described. Stages the monochromator modified making an incident X-ray intensity more stable experiments. Absolute photon flux densities were measured with energy. A ultrahigh vacuum system is introduced preliminary measurements from ordered oxygen on Pt (111) surface.
We have reexamined the valence-band (VB) and core-level electronic structure of NiO by means hard soft x-ray photoemission spectroscopies. The spectral weight lowest energy state was found to be enhanced in bulk sensitive Ni 2p spectrum. A configuration-interaction model including a bound screening has shown agreement with spectrum off- on-resonance VB spectra. These results identify states spectra as Zhang-Rice (ZR) doublet states, consistent spin-fermion recent ab initio calculations...
An extremely high resolution flat field type slit less soft x-ray emission spectrometer has been designed and constructed for the long undulator beamline BL07LSU in SPring-8. By optimizing ruling parameters of two cylindrical gratings, a energy ΔE < 100 meV and/or an E∕ΔE ~ 10 000 are expected range 350 eV - 750 taking into account broadening by spatial (25 μm) CCD detector. A coma-free operation mode proposed Strocov et al., is also applied to eliminate both defocus coma aberrations. The...
High-energy-resolution $\mathrm{C}\phantom{\rule{0.2em}{0ex}}1s$ photoelectron spectra of graphite were measured at excitation energies 340, 870, 5950, and $7940\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ using synchrotron radiation. On increasing the energy, i.e., kinetic energy photoelectron, bulk origin peak position shifts to higher binding energies. This systematic shift is due kinetic-energy loss high-energy by kicking atom clear evidence recoil effect in emission. It also observed that...
We report on the electronic structure and Fermi surfaces of transition-metal dichalcogenide $1{\text{T-VS}}_{2}$ in low-temperature charge-density-wave (CDW) ordered phase. Using soft x-ray angle-resolved photoemission spectroscopy (ARPES), we investigate in-plane out-of-plane vanadium- sulfur-derived band dispersions identify ${k}_{z}$ this layered system. Core-level absorption show that vanadium electrons are ${d}^{1}$ configuration while $2p\text{\ensuremath{-}}3d$ resonant ARPES shows...
The temperature $(T)$-dependent metal-insulator transition (MIT) in ${\text{VO}}_{2}$ is investigated using bulk sensitive hard-x-ray $(\ensuremath{\sim}8\text{ }\text{keV})$ valence-band, core-level, and $\text{V}\text{ }2p\ensuremath{-}3d$ resonant photoemission spectroscopies (PESs). valence-band core-level spectra are compared with full-multiplet cluster model calculations including a coherent screening channel. Across the MIT, }3d$ spectral weight transfer from...