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- E-ISSN 2288-8985
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- P-ISSN1225-0163
- E-ISSN2288-8985
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Laser-induced plasma emission spectra of halogens in the helium gas flow and pulsed jet
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2013, v.26 no.4, pp.235-244
https://doi.org/10.5806/AST.2013.26.4.235
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(2013). Laser-induced plasma emission spectra of halogens in the helium gas flow and pulsed jet. Analytical Science and Technology, 26(4), 235-244, https://doi.org/10.5806/AST.2013.26.4.235
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Abstract
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 905.833nm 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.
- keywords
- elemental analysis, plasma, LIBS, halogens, flame retardant
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