Abstract
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 µs in the flame environment, which has the potential to improve LIBS sensitivity and spectral resolution.
Highlights
Laser-induced breakdown spectroscopy (LIBS) has been a powerful and useful element analysis technique in recent years
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
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 μs in the flame environment, which has the potential to improve LIBS sensitivity and spectral resolution
Summary
Laser-induced breakdown spectroscopy (LIBS) has been a powerful and useful element analysis technique in recent years. Because the plasma is formed by focused laser irradiation, it has many advantages including the capability of multielement detection, ability to detect solid, liquid and gas targets, no sample preparation, realtime and in situ analysis, nearly nondestructive measurements [1] These advantages of LIBS offer a wide range of applications, such as aerosol analysis [2], biomedical analysis [3], pharmaceutical materials analysis [4], environment analysis [5,6], and cultural heritage objects analysis [7]. Generation of hightemperature and low-density plasmas in LIBS to improve the spectral resolution has been achieved by introducing a second laser pulse to re-ablate the laser-induced particles with delays up to milliseconds [17]. These high-temperature and low-density plasmas have the potential of spectral resolution improvement
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