Emission characteristics of copper plasma in laser-induced breakdown spectroscopy (Contract research)

Maruyama, Yoichiro; Wakaida, Ikuo  

Plasma emission characteristics of copper were studied by using Laser-Induced Breakdown Spectroscopy (LIBS). The intensity of plasma emission depended on the species of atmospheric gases, and the strongest plasma emission was obtained in the Ar atmosphere. And it was observed that the intensity reached its maximum at 1-2 microseconds after the ablation and decreased. The spectrum broadening due to Stark effect was observed and the spectral width varied with the observed time and the atmospheric gases, and the narrowest spectral width was obtained in He atmosphere. The plasma temperature calculated from spectral intensities reached around 10,000 K at 1-2 microseconds after the ablation and increased with increasing ablation laser energy.