Holo-Modulated Plasma for Suppressing Background Emission in Laser-Induced Shock Wave Plasma Spectroscopy

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  • Suyanto Hery
    Research Center of CV. Maju Makmur Mandiri, Srengseng Raya No. 40
  • Kurniawan Hendrik
    Research Center of CV. Maju Makmur Mandiri, Srengseng Raya No. 40
  • Lie Tjung Jie
    Meridien Counseling, Taman Sari Raya No. 85P
  • Tjia May On
    Department of Physics. Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology
  • Kagawa Kiichiro
    Department of Physics, Faculty of Education and Regional Studies, Fukui University

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  • Hole-Modulated Plasma for Suppressing Background Emission in Laser-Induced Shock Wave Plasma Spectroscopy

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An experimental study has been carried out on the dynamical process taking place in the partially confined secondary plasma generated by a Q-switched Nd-YAG laser (47 mJ, 8 ns) focused into a small hole of proper size on a zinc plate in a surrounding air of reduced pressure. The undesirable continuum emission from the primary plasma is effectively kept within the hole, away from the expanding secondary plasma, and enhances the detection sensitivity of the plasma emission in elemental analysis. The simultaneous detection of density jump and emission of Zn I 481.0 nm and the time profile of averaged temperature in the expanding plasma support the scenario of the shock wave excitation mechanism, which has been proposed by the present authors.

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