Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

Doppler splitting appeared after the plume front passed because of the formation of the contact layer and quasi-cavity in the plasma plume and the movement of atoms in the lateral direction at a high vacuum.

DOI： 10.1039/d2ja00177b

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

This study presents the first experimental evidence of direct H₂ production from seawater without harmful gas emissions (e.g., CO₂, Cl₂), which uses multiphoton ionization water splitting with a femtosecond pulse laser.

DOI： 10.1039/d2ra01337a

Web of Science

Scopus

PubMed

CiNii Research

Language：Japanese   Publisher：Institute of Applied Plasma Science  

The alumina reduction method using laser ablation has been developed for recent several years. In this study, translational temperature and column density measurements of laser ablation plasma generated by nanosecond pulsed laser were conducted. Laser absorption spectroscopy using Al I 394.401 nm was performed at the pressure of 10 Pa and the translational temperature and column density were determined by spectral fittings to the Gaussian function. These peak values at the height of 5 mm were 10,200 K and 1.5×1017 m-2, respectively. The column density decreased at a height farther than 8 mm because of recombination and this affects the alumina reduction efficiency directly, which suggests that the height of the collected plate should be adjusted according to the pressure to increase the collected mass of the ejected Al atoms.

DOI： 10.34377/aps.30.2_65

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Iron and Steel Institute of Japan  

<p>Isotope analysis is challenging because spectral resolution is reduced in high-temperature plasma. In this study, a method involving Lamb-dip laser-induced fluorescence spectroscopy combined with a supersonic plasma jet was developed for the detection of strontium (Sr) isotopes. This newly developed system, with a counter-propagating laser configuration to provide an incident laser beam intensity of 61.8 mW mm⁻², selectively detected the Lamb-dip of ⁸⁸Sr using a spectral frequency width of 35 MHz.</p>

DOI： 10.2355/isijinternational.ISIJINT-2022-080

Web of Science

Scopus

CiNii Research

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：The Society of Chemical Engineers, Japan  

<p>The direct production method of H₂ gas from seawater using femtosecond pulse laser was developed. This approach uses the photolysis triggered by multiphoton absorption of H₂O molecules and does not emit greenhouse or harmful gas such as CO₂ and Cl₂. In this study, direct H₂ production from seawater without desalination was demonstrated, and influences of focusing lens and salinity on H₂ production were experimentally revealed with a gas chromatograph. Aqueous solutions with moderate salinity (0.1-4%) showed a positive effect on H₂ production owing to nonlinear optical effects by ultrashort laser pulses, while excessive salt (the salinity of 7.0%) interfered with the ionization of H₂O.</p>

DOI： 10.1252/iches.2022.007

CiNii Research

Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Event date： 2023.6

Language：English   Presentation type：Poster presentation  

Event date： 2022.12

Event date： 2022.10

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Application no：2021-200814  Date applied：2021.12

Application no：特願2017-064440  Date applied：2017.3

Announcement no：公開2018-169179 

Patent/Registration no：6918307  Date registered：2021.7 

Country of applicant：Domestic  

Application no：特願2017-064440  Date applied：2017.3