Some notes on the role of meta-stable excited state of helium atom in laser-induced helium gas breakdown spectroscopy |
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Authors: | M Ramli K Kagawa SN Abdulmadjid N Idris WS Budi MA Marpaung KH Kurniawan TJ Lie MM Suliyanti R Hedwig M Pardede ZS Lie MO Tjia |
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Institution: | (1) Department of Physics, Faculty of Education and Regional Studies, Fukui University, 9-1 bunkyo 3-chome, Fukui 910, Japan;(2) Department of Physics, Faculty of Mathematics and Natural Sciences, Syiah Kuala University, Darussalam, Banda Aceh, 23116, Indonesia;(3) Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, Tembalang Campus, Semarang, Central Java, Indonesia;(4) Department of Physics, Faculty of Mathematics and Natural Sciences, Jakarta State University, Rawamangun, Jakarta, Indonesia;(5) Research Center of Maju Makmur Mandiri Foundation, 40 Srengseng Raya, Kembangan, Jakarta Barat, 11630, Indonesia;(6) Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, 10 Ganesha, Bandung, 40132, Indonesia |
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Abstract: | A study of the experimental results on the plasma emissions of water and ethanol vapor samples, induced by Nd:YAG laser in
ambient helium and nitrogen gases at atmospheric pressure, is presented here. The result reveals distinct geometrical and
spectral characteristics of the plasma emissions generated in the helium gas when compared to those observed from nitrogen
gas plasma. Most remarkable is the narrow line width and low continuum background exhibited by emission lines of the analyte
atoms from helium plasma, including the hydrogen emission line which is known to suffer from notorious broadening effects
in conventional laser induced breakdown spectroscopy (LIBS). It is further shown on the basis of the measured spatial distributions
and time profiles of the emission intensities, that the excellent spectral quality is attained by taking advantage of the
meta-stable excited state of helium atoms for the delayed excitation of the hydrogen and other analyte atoms, this allows
the detection of those atomic emissions to be performed under more favorable conditions. The result of this study has thus
demonstrated the feasibility of achieving high-quality spectrochemical analysis, including hydrogen analysis with laser-induced
helium gas breakdown spectroscopy.
PACS 52.38.Mf |
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