A5009517413- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Fullerene Chemistry and Applications
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Diamond and Carbon-based Materials Research
- Advancements in Battery Materials
- Laser-Matter Interactions and Applications
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Advanced Chemical Physics Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Electronic and Structural Properties of Oxides
- Nuclear Physics and Applications
- Transition Metal Oxide Nanomaterials
- Atomic and Subatomic Physics Research
- Magnetic and transport properties of perovskites and related materials
- Spectroscopy and Laser Applications
- Bone health and osteoporosis research
- Semiconductor materials and interfaces
Kyoto University
2016-2025
The University of Tokyo
2022
High Energy Accelerator Research Organization
2022
Institute of Materials Structure Science
2022
Osaka University
2022
Korea Foundation for Max Planck POSTECH
2022
Tokyo Metropolitan University
2008-2018
Genesis Research Institute
2006-2012
Rakuwakai Otowa Hospital
2004-2006
Japan Science and Technology Agency
2002
We report conclusive evidence of an efficient cooling mechanism via the electronic radiative transitions hot small molecular anions isolated in vacuum. stored ${{\mathrm{C}}_{6}}^{\ensuremath{-}}$ and ${\mathrm{C}}_{6}{\mathrm{H}}^{\ensuremath{-}}$ ion storage ring observed laser-induced electron detachment with delays up to several milliseconds. The terminal hydrogen atom caused a drastic change decay profiles. photoexcited is slow nonexponential, which can be explained by depletion...
Abstract We report on the measurement of deep inner-shell 2 p X-ray photoelectron diffraction (XPD) patterns from laser-aligned I molecules using free-electron laser (XFEL) pulses. The XPD molecules, aligned parallel to polarization vector XFEL, were well matched with our theoretical calculations. Further, we propose a criterion for applying molecular-structure-determination methodology experimental data. In turn, have demonstrated that this approach is significant step toward time-resolved...
Electrochemically inserting and extracting hydrogen into from solids are promising ways to explore materials' phases properties. However, it is still challenging identify the structural factors that promote insertion extraction develop materials whose functional properties can be largely modulated by through solid-state reactions at room temperature. In this study, guided theoretical calculations on energies of oxygen reduction with oxygen-deficient perovskite oxides, we demonstrated vacancy...
Abstract In this study, we grew (010)-oriented epitaxial films of brownmillerite-structured SrCoO2.5 on various substrates whose lattice mismatch against SCO ranged from 0 to -2.9% by pulsed laser deposition and investigated the effect substrate-induced strain their protonation in field transistor structures with gate layers consisting Nafion membranes. We found that H concentration were fully compressive-strained up 1.3 % was ~1.7 it almost independent magnitude strain. also content...
Abstract We epitaxially grew rutile-structured VO2 films with various out-of-plane lattice constants on (001) TiO2 substrates by pulsed laser deposition and investigated their protonation electrochemically injecting protons to the in transistor structures gate layers of proton conducting Nafion membranes. found that expansion are less protonated. On basis experimental results, we discuss correlation between epitaxial highlight reducing defects is key promoting films. 

Abstract Lithium metal is a promising anode material for the development of advanced all-solid-state batteries (ASSBs) with high energy density. Among various solid electrolytes, lithium phosphorus oxynitride glass electrolyte (LiPON) notable facilitating stable Li plating-stripping reactions in ASSBs employing metal. The aim this study to examine Li/LiPON interface, specific emphasis on reductive decomposition LiPON near interface. We employed time-of-flight elastic recoil detection...
Abstract We have successfully determined the internuclear distance of I 2 molecules in an alignment laser field by applying our molecular structure determination methodology to p X-ray photoelectron diffraction profile observed with femtosecond free electron pulses. Using this methodology, we found that sample Nd:YAG 6 × 10 11 W/cm is elongated from 0.18 0.30 Å “in average” relatively equilibrium 2.666 Å. Thus, present experiment constitutes a critical step towards goal imaging chemical...
In this study, the recurrent fluorescence of naphthalene ions was investigated using an electrostatic ion beam trap. The number photons from on ${D}_{2}\ensuremath{\rightarrow}{D}_{0}$ transition measured as a function time, after production by electron impact. emission observed over time range approximately 10 ms. variation in for such long could be explained conducting simulations previously reported theoretical rate constants both fragmentation and vibrationally hot ions.
To electrochemically control structural and transport properties of oxygen-deficient perovskite SrFeOy (2.5 ≦ y 3) (SFO) epitaxial films, we employed electric-field-effect transistor structures in which the proton-conducting solid electrolyte Nafion is used as a gate insulator. When positive voltage (VGS) applied protons are injected toward film channel layer, SFO films reduced, leading to increases resistance. On other hand, when negative VGS removed, oxidized, result, resistances decrease....
A novel experimental technique has been developed to observe a trace of optical absorption free mass-selected ions. The combines linear radio-frequency ion trap with high-finesse cavity perform ring-down spectroscopy (photon-trap for generality), where the storage lifetime photons in provides sensitivity high enough probe trapped Absorption spectra manganese Mn+ are presented, showing hyperfine structures P2,3,47←S37 transitions ultraviolet range. Implementation solenoidal magnet allows us...
Collision-induced ionization and fragmentation of ${\mathrm{C}}_{60}$ molecules are studied using 2-MeV ${\mathrm{Li}}^{q+}$ projectile ions with $q=1--3.$ Cross sections for the production fragment ${\mathrm{C}}_{n}^{+}$ $(n=1--14)$ ionized parent ${\mathrm{C}}_{60}^{r+}$ $(r=1--4)$ were obtained by time-of-flight measurements in coincidence outgoing projectiles charge states k ranging from 0 to 3. The mass-to-charge spectra revealed a wide variety distribution patterns different...
The recurrent fluorescence of anthracene cations (C14H10+) was investigated using an electrostatic ion beam trap. photon emission from the excited confined in trap observed order milliseconds. yields as a function wavelength range 450–860 nm were measured by optical filters and cooled photomultiplier, which revealed that is attributed to D2 → D0 transition C14H10+. However, time considerably longer than spontaneous induced (<1 μs). number photons emitted C14H10+ calculated previously...
Abstract Electrochemical reactions with insertions of ions in solids depend on crystallographic orientations. We investigated electrochemical responses (100), (110) and (111)-oriented oxygen-deficient perovskite SrFeO 2.5+ y epitaxial films electric-field-effect transistor structures the proton-conducting electrolyte Nafion as a gate insulator. found that only (100)-oriented exhibit changes associated gate-voltage-induced reductions. Furthermore, elastic recoil detection analysis shows...
A new, compact electrostatic storage ring for atomic and molecular physics is planned to be built at RIKEN, Japan. The new will cooled down below 10 K store rotationally cold ions a long period.
We have explored the spatial distribution of an ion cloud trapped in a linear octopole radio-frequency (rf) trap. The two-dimensional column density stored Ag${}_{2}^{+}$ was measured via photofragment-ion yields as function position incident laser beam over transverse cross section profile found to be dependent on number loaded ions. Under high ion-loading conditions with significant space-charge effect, ions form ring maximum at outer region trap, whereas they are localized near center...
We investigate correlations between multiple ionization and fragmentation processes of the ethane molecule in collisions with $580\text{\ensuremath{-}}\mathrm{keV}\phantom{\rule{0.16em}{0ex}}{\mathrm{C}}^{+}$ ions under single-electron capture loss conditions. Employing an electron counting technique, we directly obtain number distributions ionized electrons, which correspond to probabilities ethane. In addition, patterns as a function charge state $r$ intermediate parent...
Depth profiles of Li in a Li‐ion battery system Au/LiCoO 2 /LATP/Pt (LATP:Li 1+X+Y Al Y Ti 2−Y Ge X P 3−X O 12 ) have been situ measured at several stages charging by means the elastic recoil detection (ERD) and Rutherford backscattering (RBS) techniques with 9 MeV 4+ ion beam. The thicknesses LiCoO Au are estimated from RBS spectrum for as‐received specimen to be 190 27 nm, respectively. From ERD spectrum, it is also found that there exists impurity hydrogen ~5% . Moreover, data analysis...
The effect of aqueous environment on fast heavy-ion radiation damage biomolecules was studied by comparative experiments using liquid- and gas-phase amino acid targets. Three types acids with different chemical structures were used: glycine, proline, hydroxyproline. Ion-induced reaction products analyzed time-of-flight secondary-ion mass spectrometry. results showed that fragments from the resulting C—Cα bond cleavage major for both For liquid-phase targets, specific originating reactions in...
The influence of secondary electrons on radiation damage biomolecules in water was studied by fast heavy-ion irradiation biomolecular solutions. Water microdroplets containing the amino acid glycine under vacuum were irradiated carbon projectiles with energies 0.8–8.0 MeV. A variety fragments from droplets observed time-of-flight secondary-ion mass spectrometry: methylene amine cation and formate anion originating cleavage C–Cα bonds, cyanide generated multiple protonated deprotonated...