Journal
OPTICAL MATERIALS
Volume 131, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2022.112731
Keywords
Laser -induced breakdown spectroscopy; Cu -Ni; Electron density; Electron temperature
Categories
Funding
- Princess Nourah bint Abdulrahman University Researchers Sup-porting Project [PNURSP2022R16]
- Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
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The research demonstrates the importance of selecting the right laser wavelength in LIBS analysis, as using Cu and Ni spectral lines resulted in different calculated plasma temperatures.
The current research is focusing on generation a plasma from a standard copper-nickel alloy using a Q-switched Nd:YAG laser with its fundamental wavelength (1064 nm) and its second harmonic generation (532 nm) in the air at atmospheric pressure. The results showed that the used wavelengths have a crucial effect on LIBS self-absorption implying choosing the right laser wavelength in the analysis as the calculated plasma temperatures were different upon using Cu and Ni spectral lines, one at a time. To get plasma temperatures with good con-fidence, the calculated plasma temperatures by two methods; Boltzmann plot (using Cu lines) and Saha-Boltzmann plot (using Ni lines) were corrected against self-absorption. Finally, a shorter excitation wave-length (532 nm) was shown to have spectral lines with higher electron densities since the absorbed energy by the ablated target is higher at 532 nm than that at 1064 nm.
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