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Opt Express. 2014 Apr 7;22(7):7686-93. doi: 10.1364/OE.22.007686.

Flame-enhanced laser-induced breakdown spectroscopy.


Flame-enhanced laser-induced breakdown spectroscopy (LIBS) was investigated to improve the sensitivity of LIBS. It was realized by generating laser-induced plasmas in the blue outer envelope of a neutral oxy-acetylene flame. Fast imaging and temporally resolved spectroscopy of the plasmas were carried out. Enhanced intensity of up to 4 times and narrowed full width at half maximum (FWHM) down to 60% for emission lines were observed. Electron temperatures and densities were calculated to investigate the flame effects on plasma evolution. These calculated electron temperatures and densities showed that high-temperature and low-density plasmas were achieved before 4 ┬Ás in the flame environment, which has the potential to improve LIBS sensitivity and spectral resolution.

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