From Plasma Jets to Pulsed Laser: A Comparative Spectroscopic Perspective on Copper Emission.

Muna Ahmed issa, Ahmed S. Jaber, Sawsan H. Abdullah

Abstract

Two approaches were applied to the spectroscopic study of plasma: the plasma jet technique and the pulsed laser. The plasma from the Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser had much higher Cu I emission than the plasma jet, which could be related to the better excitation and ablation of the plasma. The plasma jet produced a wider range of spectra with strong contributions of Ar I and N2/N2+. This indicates an excitation that is continuous and driven by gases. As for electron temperatures, the plasma created by the laser showed high temperatures, ranging from 0.869 to 0.884 eV, very different from the plasma jet readings, in the range of 0.501 to 0.621 eV. This indicates that laser ablation is more effective in heating electrons due to its fast and localized nature. The plasma jet density rose from 1.216 x 10^18 cm^-3 to 1.351 x 10^18 cm^- 3 as the argon flow rate increased, and the laser plasma density rose from 1.146 x 10^18 cm^-3 to 1.251 x 10^18 cm^-3 as the pulse energy increased. Even with the laser plasma showing a higher electron temperature, the plasma jet reached a higher peak electron density for the specific conditions of the experiment. The plasma jet had a Debye length between 4.77 x 10^-6 and 5.04 x 10^-6 cm, and its Debye numbers were between 553 and 723. This suggests more robust electrostatic shielding and a smaller plasma. On the other hand, the Nd:YAG laser plasma had larger Debye lengths from 6.25 x 10^-6 to 6.47 x 10^- 6 cm, and its Debye numbers were significantly larger, ranging from 1277 to 1299.

Keywords

Spectroscopic; plasma parameters; Plasma jet; Pulsed laser deposition (PLD); Copper sheet; SPSS.

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References

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DOI: https://doi.org/10.20961/jeeict.8.2.123250

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