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Physics Journal of the Indonesian Physical Society
http://situs.jurnal.lipi.go.id/pjhfi/   -   http://pj.hfi.fisika.net


1Tjung Jie Lie, 2Hery Suyanto, 3Kiichiro agawa, 4May On Tjia,`` and 5Hendrik Kurniawan

1Meridien Counseling, Taman Sari Raya 85P, Jakarta 11150, Indonesia
2Department of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Bukit Jimbaran, Bali, Indonesia
3Department of Physics, Faculty of Education and Regional Studies, Fukui University, 9-1 bunkyo 3-chome, Fukui 910, Japan
4Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Ganesha 10, Bandung, Indonesia
5Research Center of CV. Maju Makmur Mandiri, Srengseng Raya 40, Jakarta 11630, Indonesia

Laser Induced Shock Wave Plasma Spectroscopy (LISPS) was used for the elemental qualitative analysis of Sangiran soil layer by directing the radiation of Nd-YAG laser of energy of 79 mJ and pulse width of 8 ns at fundamental wavelength into the soil powder directly by introducing an unique sample holder. The generated cylindrically confined secondary plasma emission was analyzed using an Optical Multichannel Analyzer (OMA) simultaneously with the detection of its time profile using time-resolved spectroscopy imaging technique. Aside of Si, Mg, Ca, Fe, K, Na, O, C, Al found in the sample, the generated spectra showed unambiguous signature of the onset of the emission of H I 656.2 nm (Ha) which is usually improbable to detect using ordinary laser ablation technique. By comparing the Si and Ha time profiles, it was also confirmed that the generation of hydrogen emission was also due to the shock wave mechanism. The method was then applied to the detection limit measurement of hydrogen emission in soil by comparing with those obtained using known quartz sample concentration and the result showed a detection limit of less than 10 ppm of Ha emission.

Publication : Physics Journal IPS A5 (2003) 0214 » page of Content
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