A5025573905- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Mass Spectrometry Techniques and Applications
- Semiconductor materials and devices
- Magnetic confinement fusion research
- Ion-surface interactions and analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Copper Interconnects and Reliability
- Plasma Diagnostics and Applications
- Diamond and Carbon-based Materials Research
- Anodic Oxide Films and Nanostructures
- Solar and Space Plasma Dynamics
- Advanced Chemical Physics Studies
- Molecular Junctions and Nanostructures
- Electron and X-Ray Spectroscopy Techniques
- Silicon Nanostructures and Photoluminescence
- Fusion materials and technologies
- Nanowire Synthesis and Applications
- Metal and Thin Film Mechanics
- Electrodeposition and Electroless Coatings
- Gold and Silver Nanoparticles Synthesis and Applications
- Ionosphere and magnetosphere dynamics
- Quantum Dots Synthesis And Properties
- Silicon and Solar Cell Technologies
- Electronic Packaging and Soldering Technologies
National Institute for Fusion Science
2016-2025
Hiroshima University
2010-2025
National Institutes of Natural Sciences
2016-2025
The Graduate University for Advanced Studies, SOKENDAI
2017-2025
Kobe University
2020
University of Toyama
2017
Lanzhou University of Technology
2017
National Institutes for Quantum Science and Technology
2017
University College Dublin
2017
Utsunomiya University
2017
Abstract Ejected material from neutron star mergers gives rise to electromagnetic emission powered by radioactive decays of r -process nuclei, the so-called kilonova or macronova. While properties are largely affected opacities in ejected material, available atomic data for elements still limited. We perform structure calculations elements: Se ( Z = 34), Ru 44), Te 52), Ba 56), Nd 60), and Er 68). confirm that bound–bound transitions open f -shell, lanthanide (Nd Er) higher than those other...
The possibility of fabricating a highly regular nanohole array using different acid mixtures for the anodic oxidation aluminum was investigated. regularity formed 1:1 sulfuric/oxalic mixture quantified. Excellent obtained at around an anode voltage 32 to 36 V. Cell pitch V 73 nm, which falls between those sulfuric (65 nm 28 V) and oxalic (95 40 V). present results strongly suggest that can be varied by changing ratio acids. © 2004 Electrochemical Society. All rights reserved.
Resonant strengths have been measured for dielectronic recombination of Li-like iodine, holmium, and bismuth using an electron beam ion trap. By observing the atomic number dependence state-resolved resonant strength, clear experimental evidence has obtained that importance generalized Breit interaction (GBI) effect on increases as increases. In particular, it shown GBI is exceptionally strong through state [1s2s(2)2p(1/2)](1).
A compact electron beam ion trap (EBIT) has been constructed for spectroscopic studies of moderate charge state ions. The energy range the present EBIT is 100–1000eV, which it rather difficult to operate an ordinary used be designed operation with higher (∼10keV or more). To cut down running costs, a superconducting wire high critical temperature central magnet so that can operated without liquid helium. performance investigated through visible spectroscopy highly charged krypton and iron
We have measured extreme ultraviolet (EUV) spectra from highly charged tungsten ions in low-density and high-temperature plasmas produced the Large Helical Device at National Institute for Fusion Science. The EUV emitted after injection of a pellet into hydrogen plasma were recorded temperatures 1.5 3 keV dominated by an intense transition array 4.5–6.5 nm region, profile extent which was different both spectra. Some discrete lines present identified comparison with existing spectral data...
Bottom-up fill of Cu in deep submicrometer via holes was achieved through electroless plating alone for the first time. We investigated effect addition inhibitor molecules to solution, and found that sulfopropyl sulfonate (SPS) highly effective promoting bottom-up fill. The tendency filling enhanced by shrinkage hole diameter. This suggests diffusion flux SPS bottom more suppressed smaller holes. Thus, deposition rate near is larger than outside hole, leading filling. © 2004 Electrochemical...
Layer-by-layer etching of silicon on atomic scale has been achieved by repeating the reaction cycles fluorine (F) atom adsorption a cooled Si surface and subsequent Ar + ion (≃20 eV) irradiation which induces fluorine/Si reactions. The digital etch rate first increases reaches plateau region with an increase time. For case CF 4 /O 2 downstream plasma as source, x radical accumulation appears to be self-limiting stop F/Si promote layer etching, while F atoms produced remote NF 3 or /95%He...
Bright narrow band emission observed in optically thin plasmas of high-Z elements the extreme ultraviolet spectral region follows a quasi-Moseley's law. The peak wavelength can be expressed as λ=(21.86±12.09)×R∞−1×(Z−(23.23±2.87))−(1.52±0.12), where R∞ is Rydberg constant. varies from 13.5 nm to 4.0 atomic number, Z, increases Z = 50 83. range wavelengths available hot permits development bright laboratory-scale sources for applications including x-ray microscopy and absorption fine...
A highly ordered monolayer film of alkanethiol-encapsulated gold nanoparticles was fabricated on a silicon substrate by using the Langmuir–Blodgett (LB) method. The effects particle order, concentration and type solvent LB spreading suspension encapsulated particles, were studied. We found that low 0.06–0.3 mg/mL in chloroform is optimal for fabrication high quality monolayers. Since proposed method not restricted to it believed be practical process fabricating quantum dot structures various...
The bottom-up fill of copper in fine via holes is reported electroless plating with the addition bis(3-sulfopropyl) disulfide (SPS). When concentration SPS bath was varied from 0.05 to 0.5 mg/L a time 10 min, ratio Cu thickness at bottom hole that surface called ratio, increased 1.05 2.8 for ⊘ 1.0 μm hole. increases and decreases an increase diameter. X-ray diffraction structure analyses cross-sectional transmission electron microscopy observations indicated grain size film reduced by...
A novel concept on digital chemical vapor deposition (CVD) and etching technologies is described. ArF excimer laser irradiation to a condensed Si2H6 layer substrate cooled −70 °C has resulted in spatially selective poly-Si film growth. The adsorbate thickness control by gas pressure temperature allows shot atomic growth of Si. Digital CVD SiO2 also achieved repetitive cycles silane radical subsequent oxidation. This reaction promoted an alternate introduction pulsed microwave-discharged SiH4...
The effects of the surface pressure on particle arrangement Langmuir-Blodgett (LB) monolayers alkanethiol-capped gold nanoparticles were studied. LB prepared from a highly concentrated solution, which increases film fabrication efficiency but readily causes small voids in array. Overcompressing monolayer to high restructured particles and eliminated voids. When capped by dodecanethiol 8.5 nm diameter, was vastly improved wafer-scale transferred onto substrate at 20 mN/m.
The effect of annealing in an ultrahigh vacuum on the chemical structure diamondlike carbon (DLC) was investigated using photoelectron spectroscopy, thermal desorption electrical resistivity, and micro-Raman spectroscopy measurements. line shapes C 1s spectra depended temperature. relative intensities four components were quantitatively evaluated: sp3 with carbon-carbon bonds (C–C carbon), sp2 hydrogen-carbon (H–C carbon). variation ratio demonstrated that hydrogen DLC is emitted to outside...
In the Large Helical Device (LHD) operated with a metallic (stainless steel) first wall, it is found that iron density, nFe, at plasma core fairly low (nFe ⩽ 108 cm−3) in general neutral beam (NB)-heated discharges, while quickly increases appearance of impurity accumulation when multi-hydrogen ice pellet injected or NB input power largely reduced. Although highest density 1010 centre LHD observed from such suggests still concentration (nFe/ne < 10−3). Therefore, edge transport ergodic...
We present extreme ultraviolet and visible spectra of promethiumlike tungsten gold obtained with an electron beam ion trap (EBIT). Although the contributions from a few charge states are involved in spectra, state assigned to observed lines is definitely identified by time-of-flight analysis ions performed at same time spectroscopic measurements. Experimental results compared collisional-radiative model calculations as well previous experimental theoretical studies.
Tungsten (W) spectroscopy has attracted significant attention because W is one of the major impurities in ITER and future DEMO reactors. W22+–W33+ spectra at 15–45 Å have been useful for impurity diagnostics. Unresolved Transition Array (UTA) around 200 Å, which contain W17+–W23+, potential diagnostics tungsten ions even lower charge states. Because multiple states overlap with very similar wavelengths, it challenging to evaluate spatial profiles from UTA Å. In this study, we conducted...
$KLL$ dielectronic recombination resonances, where a free electron is captured into the $L$ shell and at same time $K$ excited shell, have been measured for open iodine ions by measuring detected yield of escaping various charge states modeling balance in an beam ion trap. In modeling, escape from trap multiple exchange were considered. Extracted used to measure The different clearly separated, which along with correction artifacts connected made highly charged measurements this type...
The diagnostic capability of Fe xiii line features seen in the 170–210 Å waveband EUV Imaging Spectrometer (EIS) on Hinode is investigated, with emphasis density diagnostics applied to solar active regions. Four pairs are found yield consistent densities ranging from 108.5 109.5 cm−3 across an region using a new theoretical model ion. In separate EIS observations small flare, widely used pair, λ203.8/λ202.0, reach high limit predicted by iron
The chemical structure of diamondlike carbon (DLC) has been clarified by means the quantitative analysis C 1s X-ray photoelectron spectra DLC films with different electrical resistivities prepared unbalanced magnetron sputtering (UBMS) method. observed showed asymmetric shapes and shifts peak positions depending on resistivity films. Every spectrum was decomposed into four components that were represented Doniach–Šunjić (DŠ) function convoluted a Gaussian function. structures corresponding...