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KMID : 0385520130260040235
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Analytical Science & Technology
2013 Volume.26 No. 4 p.235 ~ p.244
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Laser-induced plasma emission spectra of halogens in the helium gas flow and pulsed jet
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Lee Yong-Hoon
Choi Dae-woong
Gong Yong-deuk
Nam Sang-Ho
Nah Chang-woon
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Abstract
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Detection of halogens using laser-induced breakdown spectroscopy (LIBS) in open air is very difficult since their strong atomic emission lines are located in VUV region. In NIR region, there are other emission lines of halogens through electronic transitions between excited states. However, these lines undergo Stark broadening severely. We report the observation of the emission lines of halogens in laser-induced plasma (LIP) spectra in NIR region using a helium gas flow. Particularly, the emission lines of iodine at 804.374 and 905.833 nm from LIPs have been observed for the first time. In the helium ambient gas, Stark broadening of the emission lines and background continuum emission could be suppressed significantly. Variations of the line intensity, plasma temperature, and electron density with the helium flow rate was investigated. Detection of chlorine and bromine in flame retardant of rubbers was demonstrated using this method. Finally, we suggest a pulsed helium gas jet as a practical and ecomonical helium gas source for the LIBS analysis of halogens in open air.
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KEYWORD
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elemental analysis, plasma, LIBS, halogens, flame retardant,
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