Nasrullah Idris, Takao Kobayashi, Maria Margaretha Sullyanti, Hendrik Kurniawan, Tjung Jie Lie, Kiichiro Kagawa, Yong-Inn Lee
A Transversely Excited Atmospheric (TEA) CO 2 laser beam (500 mJ, 200 ns) was focused on soft solid organic compounds under a low-pressure surrounding gas at around 2 Torr. We found that in order to induce a laser plasma from solid organic sample, such as plastics, the ablated atoms must be confined in a small hole (diameter of about 1 mm and depth of around 1 - 2 mm). Using our unique technique of density jump measurement (Rainbow Interferometer), we proved that the plasma is excited by a shock wave and that the confining hole works to induce and enhance a strong shock wave. The plasma has favorable characteristics for spectrochemical analysis due to its low spectral background and sharp emission lines; hence, the spectra can be taken using optical multichannel analyzer (OMA) without gated mode. By using the confinement effect, we detected chlorine ionic lines (Cl II at 479.4 nm, Cl II at 481.0 nm, and Cl II at 481.9 nm) with relatively strong emission intensities in the plastic sample containing chlorine.
Department of Fiber Amenity Engineering, Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan; Graduate Program in Opto Electrotechniques and Laser Applications, Faculty of Engineering, University of Indonesia, Jakarta 10430, 4 Salemba Raya, Indonesia; Research Centre of Maju Makmur Mandiri, Jakarta Barat 11630, Srengseng Raya No. 40, Indonesia; Department of Physics, Faculty of Education and Regional Studies, University of Fukui, Fukui 910-8507, Japan; Physics Department, Chonbuk National University, Chonju, 561-756, South Korea; Department of Physics, Faculty of Mathematics and Natural Science, Syiah Kuala University, Darussalam 23111, Indonesia
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