Ichiro Inoue
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View article: Channel-cut monochromator withstanding incident powers above 400 W on undulator beamlines
Channel-cut monochromator withstanding incident powers above 400 W on undulator beamlines Open
A liquid-nitrogen-cooled silicon channel-cut monochromator was developed and experimentally evaluated under high-thermal-load conditions. Under the maximum load of 417 W, the first reflecting surface exhibited a concave deformation, result…
View article: Automated alignment of XFEL nanofocusing mirrors via wavefront optimization
Automated alignment of XFEL nanofocusing mirrors via wavefront optimization Open
An automated alignment procedure, based on wavefront measurement with a single-grating interferometer, has been developed for precise tuning of Kirkpatrick–Baez nanofocusing mirrors for X-ray free-electron lasers (XFELs). This approach opt…
View article: Calculation of effective pump dose in X-ray-pump/X-ray-probe experiments
Calculation of effective pump dose in X-ray-pump/X-ray-probe experiments Open
In pump–probe experiments on solid materials performed within ultrafast X-ray science, the energy deposited by an X-ray pump pulse in the sample has a non-uniform spatial distribution. The following X-ray probe pulse then measures a volume…
View article: An X-ray beamline for utilizing intense, high-energy undulator radiation
An X-ray beamline for utilizing intense, high-energy undulator radiation Open
The design, development and performance of an X-ray beamline for utilizing intense, high-energy undulator radiation are presented. A double multilayer monochromator, consisting of 150 pairs of 3.33 nm periodic Cr/C multilayers, provides in…
View article: All hard X-ray transient grating spectroscopy
All hard X-ray transient grating spectroscopy Open
Optical-domain transient grating (TG) spectroscopy is the ideal tool to investigate transport phenomena in gases, liquids and solids, but it is limited to typically micron-size grating periods. Extreme-Ultraviolet TG has represented a majo…
View article: A Stress Memory Effect in Olivine at Upper Mantle Pressures and Temperatures
A Stress Memory Effect in Olivine at Upper Mantle Pressures and Temperatures Open
Cyclic deformation experiments on olivine aggregates have been conducted at pressures of 1.9–2.8 GPa and temperatures of 297–1250 K. Measurements of mechanical data combined with acoustic emission (AE) monitoring revealed that activity of …
View article: Ultra-fast heating effects in an aqueous salt solution investigated via X-ray split-and-delay technique
Ultra-fast heating effects in an aqueous salt solution investigated via X-ray split-and-delay technique Open
We present a split-and-delay study on an aqueous salt solution. We employed SACLA split-and-delay optics to split each FEL pulse into pair of two pulses and delayed one of them. The sample was delivered via a liquid jet system which was il…
View article: High throughput protein serial crystallography using a grease matrix and a large-area support film
High throughput protein serial crystallography using a grease matrix and a large-area support film Open
Serial femtosecond crystallography (SFX) using ultrashort pulses from X-ray free- electron lasers (XFELs) enables the determination of crystal structures at room temperature while minimizing radiation damage to the samples. This method inv…
View article: Nanofocused attosecond hard x-ray free-electron laser with intensity exceeding 10<sup>19</sup> W/cm<sup>2</sup>
Nanofocused attosecond hard x-ray free-electron laser with intensity exceeding 10<sup>19</sup> W/cm<sup>2</sup> Open
Attosecond hard x-ray pulses from the LCLS are focused to nanometer-sized spots using an advanced Kirkpatrick-Baez mirror system. Peak intensity at the focal point exceeds 10 19 W/cm 2 , enabling a suite of damage-free nonlinear x-ray spec…
View article: Ligand‐Mediated Quantum Yield Enhancement in 1‐D Silver Organothiolate Metal–Organic Chalcogenolates
Ligand‐Mediated Quantum Yield Enhancement in 1‐D Silver Organothiolate Metal–Organic Chalcogenolates Open
X‐ray free electron laser (XFEL) microcrystallography and synchrotron single‐crystal crystallography are used to evaluate the role of organic substituent position on the optoelectronic properties of metal–organic chalcogenolates (MOChas). …
View article: Terawatt-attosecond hard X-ray free-electron laser at high repetition rate
Terawatt-attosecond hard X-ray free-electron laser at high repetition rate Open
Ångstrom and attosecond are the fundamental spatiotemporal scales for electron dynamics in various materials. Although attosecond pulses with wavelengths comparable to the atomic scales are expected to be a key tool in advancing attosecond…
View article: Exploring x-ray irradiation conditions for triggering ultrafast diamond graphitization
Exploring x-ray irradiation conditions for triggering ultrafast diamond graphitization Open
Intense femtosecond x-ray pulses produced by an x-ray free-electron laser can trigger irreversible structural transitions in crystalline solids. For instance, irradiation of diamond can lead to graphitization and, at higher deposited doses…
View article: Nucleophilic Displacement Reactions of Silver-Based Metal–Organic Chalcogenolates
Nucleophilic Displacement Reactions of Silver-Based Metal–Organic Chalcogenolates Open
We report nucleophilic displacement reactions that can increase the dimensionality or coordination number of silver-based metal-organic chalcogenolates (MOChas). MOChas are crystalline ensembles containing one-dimensional (1D) or two-dimen…
View article: All hard X-ray transient grating spectroscopy
All hard X-ray transient grating spectroscopy Open
A microscopic understanding of matter requires the study of excitations across an extended spatial, time and frequency range. The tens of nanometer lengthscale is crucial for transport phenomena in liquids and crystals. It holds the key to…
View article: Age-related and age-independent complications in atrial fibrillation ablation: insights from the Japan ablation registry
Age-related and age-independent complications in atrial fibrillation ablation: insights from the Japan ablation registry Open
Background The growing prevalence of atrial fibrillation (AF) has intensified the focus on managing this condition in the elderly. Catheter ablation, a popular treatment option, requires more detailed examination due to limited data on its…
View article: Attosecond Inner-Shell Lasing at Angstrom Wavelengths
Attosecond Inner-Shell Lasing at Angstrom Wavelengths Open
Since the invention of the laser nonlinear effects such as filamentation, Rabi-cycling and collective emission have been explored in the optical regime leading to a wide range of scientific and industrial applications. X-ray free electron …
View article: Perspective for in-volume machining of solid materials by undersurface focusing of x-ray pulses
Perspective for in-volume machining of solid materials by undersurface focusing of x-ray pulses Open
In this perspective article we propose and discuss a possible technique of in-depth material processing based on undersurface focusing of intense x-ray pulses. Currently, x-ray free-electron lasers can produce such intense x-ray pulses wit…
View article: All hard X-ray transient grating spectroscopy
All hard X-ray transient grating spectroscopy Open
A microscopic understanding of matter requires the study of excitations across an extended spatial, time and frequency range. The tens of nanometer length-scale is crucial for transport phenomena in liquids and crystals. It holds the key t…
View article: Transient Creep in Olivine at Shallow Mantle Pressures: Implications for Time‐Dependent Rheology in Post‐Seismic Deformation
Transient Creep in Olivine at Shallow Mantle Pressures: Implications for Time‐Dependent Rheology in Post‐Seismic Deformation Open
Transient creep in olivine aggregates has been studied by stress‐relaxation experiments at pressures of 1.7–3.6 GPa and at temperatures of ≤1020 K in a DIA apparatus. Time‐dependent deformation of olivine at small strains (<0.07) was monit…
View article: Convection and joint characteristics in aluminum alloy melting zone during resistance spot welding of dissimilar Fe-Al material in external magnetic field
Convection and joint characteristics in aluminum alloy melting zone during resistance spot welding of dissimilar Fe-Al material in external magnetic field Open
In resistance spot welding (RSW) of Fe and Al alloy, an intermetallic compound (IMC) is formed at the joining interface, and it is known that the strength of the joint decreases as the IMC becomes thicker. One of the factors that determine…
View article: A versatile pressure-cell design for studying ultrafast molecular-dynamics in supercritical fluids using coherent multi-pulse x-ray scattering
A versatile pressure-cell design for studying ultrafast molecular-dynamics in supercritical fluids using coherent multi-pulse x-ray scattering Open
Supercritical fluids (SCFs) can be found in a variety of environmental and industrial processes. They exhibit an anomalous thermodynamic behavior, which originates from their fluctuating heterogeneous micro-structure. Characterizing the dy…
View article: <i>In situ</i> high-pressure pair distribution function measurement of liquid and glass by using 100 keV pink beam
<i>In situ</i> high-pressure pair distribution function measurement of liquid and glass by using 100 keV pink beam Open
Understanding the pressure-induced structural changes in liquids and amorphous materials is fundamental in a wide range of scientific fields. However, experimental investigation of the structure of liquid and amorphous material under in si…
View article: Engineering Supramolecular Hybrid Architectures with Directional Organofluorine Bonds
Engineering Supramolecular Hybrid Architectures with Directional Organofluorine Bonds Open
Crystal Engineering The ease of functionalization of organic groups attached to inorganic layers in metal–organic chalcogenolates (MOChas) makes them interesting targets for crystal engineering. In article number 2300110, Aaron S. Brewster…
View article: Hard X-ray Generation and Detection of Nanometer-Scale Localized Coherent Acoustic Wave Packets in SrTiO$_3$ and KTaO$_3$
Hard X-ray Generation and Detection of Nanometer-Scale Localized Coherent Acoustic Wave Packets in SrTiO$_3$ and KTaO$_3$ Open
We demonstrate that the absorption of femtosecond x-ray pulses can excite quasi-spherical high-wavevector coherent acoustic phonon wavepackets using an all x-ray pump and probe scattering experiment. The time- and momentum-resolved diffuse…
View article: Engineering Supramolecular Hybrid Architectures with Directional Organofluorine Bonds
Engineering Supramolecular Hybrid Architectures with Directional Organofluorine Bonds Open
Understanding how chemical modifications alter the atomic‐scale organization of materials is of fundamental importance in materials engineering and the target of considerable efforts in computational prediction. Incorporating covalent and …
View article: Modeling Femtosecond Reduction of Atomic Scattering Factors in X-ray-Excited Silicon with Boltzmann Kinetic Equations
Modeling Femtosecond Reduction of Atomic Scattering Factors in X-ray-Excited Silicon with Boltzmann Kinetic Equations Open
In this communication, we describe the application of Boltzmann kinetic equations for modeling massive electronic excitation in a silicon nanocrystal film after its irradiation with intense femtosecond hard X-ray pulses. This analysis was …
View article: Spectral-brightness optimization of an X-ray free-electron laser by machine-learning-based tuning
Spectral-brightness optimization of an X-ray free-electron laser by machine-learning-based tuning Open
A machine-learning-based beam optimizer has been implemented to maximize the spectral brightness of the X-ray free-electron laser (XFEL) pulses of SACLA. A new high-resolution single-shot inline spectrometer capable of resolving features o…