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Laser-induced plasma emission spectra of halogens in the helium gas flow and pulsed jet

헬륨 가스 플로우와 가스 펄스 젯에서 할로겐족 원소들의 레이저유도 플라즈마 방출 스펙트럼

  • Lee, Yonghoon (Department of Chemistry, Mokpo National University) ;
  • Choi, Daewoong (Department of Chemistry, Mokpo National University) ;
  • Gong, Yongdeuk (Department of Chemistry, Mokpo National University) ;
  • Nam, Sang-Ho (Department of Chemistry, Mokpo National University) ;
  • Nah, Changwoon (Department of Polymer-Nano Science and Technology, Chonbuk National University)
  • Received : 2013.04.17
  • Accepted : 2013.07.29
  • Published : 2013.08.25

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 905.833 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.

Keywords

elemental analysis;plasma;LIBS;halogens;flame retardant

Acknowledgement

Supported by : 목포대학교

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