Physics Journal of the Indonesian Physical Society
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HYDROGEN EMISSION SPECTROCHEMICAL ANALYSIS USING LASER INDUCED SHOCK WAVE PLASMA
T.J. Lie1, H. Kurniawan1, M. Pardede1, H. Suyamto1, R. Hedwig2, M.O. Tjia3, K. Kagawa4 and T. Maruyama5
1Department of Electronic Engineering, Faculty of Industrial Technique, University of Pelita Harapan 2Department of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Hardware Laboratory, Bina Nusantara University 3Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology 4Department of Physics, Faculty of Education and Regional Studies, Fukui University 5The Wakasa Wan Energy Research Center
Abstract
Nd-YAG laser of 50 mJ energy and 8 ns pulse width was focused onto quartz sample under reduced air pressure of 2 Torr. A characteristic shock wave secondary plasma was generated. The emission spectra from the plasma clearly consists of the emission lines of H I 656.2 nm (Ha) and H I 486.1 nm (Hb) which are improbable to detect using ordinary laser ablation technique. The hydrogen emission lines of the same quality were also observed from a Sangiran Meteorite found in the soil layer of 700 thousand years old in Java Island. A detection limit of less than 5 ppm was achieved for those H emission lines in this study.
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