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The role of microwaves in the enhancement of laser-induced plasma emission |
Ali Khumaeni1,*( ),Katsuaki Akaoka2,Masabumi Miyabe2,Ikuo Wakaida2 |
1. Department of Physics, Faculty of Science and Mathematics, Diponegoro University, Tembalang, Semarang 50275, Indonesia
2. Fuel Debris Analysis Group, Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency, Tokai-mura, Ibaraki-ken 311-1195, Japan |
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Abstract We studied experimentally the effect of microwaves (MWs) on the enhancement of plasma emission achieved by laser-induced breakdown spectroscopy (LIBS). A laser plasma was generated on a calcium oxide pellet by a Nd:YAG laser (5 mJ, 532 nm, 8 ns) in reduced-pressure argon surrounding gas. A MW radiation (400 W) was injected into the laser plasma via a loop antenna placed immediately above the laser plasma to enhance the plasma emission. The results confirmed that when the electromagnetic field was introduced into the laser plasma region by the MWs, the lifetime of the plasma was extended from 50 to 500 s, similar to the MW duration. Furthermore, the plasma temperature and electron density increased to approximately 10900 K and 1.5×1018 cm−3, respectively and the size of the plasma emission was extended to 15 mm in diameter. As a result, the emission intensity of Ca lines obtained using LIBS with MWs was enhanced by approximately 200 times compared to the case of LIBS without MWs.
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| Keywords
laser-induced breakdown spectroscopy
LIBS
microwave-assisted laser-induced breakdown spectroscopy
MA-LIBS
enhancement of laser plasma emission
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Corresponding Author(s):
Ali Khumaeni
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Issue Date: 28 June 2016
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