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Nakanishi, Ryuzo; Oba, Hironori; Saeki, Morihisa; Wakaida, Ikuo; Tanabe, Rie*; Ito, Yoshiro*
Optics Express (Internet), 29(4), p.5205 - 5212, 2021/02
Times Cited Count：13 Percentile：83.19(Optics)Laser-induced breakdown spectroscopy (LIBS) combined with liquid jets was applied to the detection of trace sodium (Na) in aqueous solutions. The sensitivities of two types of liquid jets were compared: a liquid cylindrical jet with a diameter of 500 
m and a liquid sheet jet with a thickness of 20 m. Compared with the cylindrical jet, the liquid sheet jet effectively reduced the splash from the laser-irradiated surface and produced long-lived luminous plasma. The limit of detection (LOD) of Na was determined to be 0.57 g/L for the sheet jet and 10.5 g/L for the cylindrical jet. The LOD obtained for the sheet jet was comparable to those obtained for commercially available inductively coupled plasma emission spectrometers.
Oba, Hironori; Saeki, Morihisa; Wakaida, Ikuo; Tanabe, Rie*; Ito, Yoshiro*
Optics Express (Internet), 22(20), p.24478 - 24490, 2014/10
Times Cited Count：17 Percentile：66.22(Optics)For aqueous-solution-based elemental analysis, we used a thin liquid sheet (m-scale thickness) in laser-induced breakdown spectroscopy with nanosecond laser pulses. Laser-induced plasma is emitted by focusing a pulsed Nd:YAG laser (1064 nm) on a 5- to 80-m-thick liquid sheet in air. To optimize the conditions for detecting elements, we studied how the signal-to-background ratio (SBR) for H
Balmer and Na-neutral emission lines depends on the liquid-sheet thickness. The SBR of the H Balmer and Na-neutral lines was maximized for a sheet thickness of 
20 m at the laser energy of 100 mJ. The hydrodynamics of liquid flow induced by the laser pulse was analyzed by laser flash shadowgraph imaging. Time-resolved observation of the hydrodynamics and plasma emission suggests that the dependence of the SBR on the liquid-sheet thickness is correlated with the volume of flowing liquid that interacts with the laser pulses.
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J.Oceanogr.Sci.Jpn., 40, p.98 - 104, 1984/00
no abstracts in English
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JAERI-M 8525, 64 Pages, 1979/11
no abstracts in English
Oba, Hironori; Toshimitsu, Masaaki; Saeki, Morihisa; Tanabe, Rie*; Ito, Yoshiro*; Wakaida, Ikuo
no journal, ,
no abstracts in English
Oba, Hironori; Toshimitsu, Masaaki; Saeki, Morihisa; Tanabe, Rie*; Ito, Yoshiro*; Wakaida, Ikuo
no journal, ,
no abstracts in English
Oba, Hironori; Saeki, Morihisa; Toshimitsu, Masaaki; Wakaida, Ikuo; Tanabe, Rie*; Ito, Yoshiro*
no journal, ,
We investigated the feasibility of laser-induced breakdown spectroscopy (LIBS) for the determination of elements in a liquid solution in the form of a jet flow and using nanosecond laser pulses. A comparison of LIBS sensitivity between two types of flows for liquid analysis was performed. A pipette nozzle tip was used to create a columnar flow of 520m diameter, whereas a trapezoidal-shaped groove nozzle tip produced an ultrathin sheet flow of 540m thickness. The limit of detection of Na atoms was estimated to be about 14 ng/mL by use of the columnar flow, whereas 1.1 ng/mL in the case of the sheet flow.
Oba, Hironori; Saeki, Morihisa; Wakaida, Ikuo; Tanabe, Rie*; Ito, Yoshiro*
no journal, ,
We applied single-pulse laser induced breakdown spectroscopy (LIBS) to liquid samples and evaluated detection sensitivity in both the liquid columnar flow and ultrathin sheet flow. The columnar flow of 0.52-mm diameter was prepared by a pipette-tip nozzle, whereas the ultrathin sheet flow with the thickness of 520m was produced by a trapezoidal-shaped groove nozzle. The detection limits were estimated for alkali metal elements (Na, Rb, and Cs) under the optimum experimental condition. The detection limit of Na in an aqueous NaCl solution for the sheet flow is found to be 1.1 ppb, which is ten times lower compared to that for the columnar flow. The detection limits for Rb and Cs with the sheet flow were 7.1 ppb and 33 ppb, respectively. In this presentation, the feasibility of the LIBS measurement with the sheet flow for the simultaneous determination of elements in the mixed aqueous solution is also discussed.
Oba, Hironori; Saeki, Morihisa; Miyabe, Masabumi; Akaoka, Katsuaki; Wakaida, Ikuo; Iwanade, Akio; Ito, Chikara; Tanabe, Rie*; Ito, Yoshiro*; Sakka, Tetsuo*; et al.
no journal, ,
no abstracts in English
