Abstract
In the present work, we have studied the temporal evolution of aluminum alloy plasma produced by the fundamental (1064 nm) of a Q-switched Nd:YAG laser by placing the target material in air at atmospheric pressure. The four Al I-neutral lines at 308.21, 309.27, 394.40 and 369.15 nm as well as Al II-ionic lines at 281.61, 385.64 and 466.30 nm are used for the determination of the electron temperature Te using Saha-Boltzmann plot method. The neutral aluminum lines were found to suffer from optical thickness which manifested itself on the form of scattered points around the Saha-Boltzmann line. The isolated optically thin hydrogen Hα-line at 656.27 nm appeared in the spectra under the same experimental conditions was used to correct the Al I-lines which contained some optical thickness. The measurements were repeated at different delay times ranging from 1 to 5 μs. The comparison between the deduced electron temperatures from aluminum neutral lines before correction against the effect self-absorption to that after correction revealed a precise value in temperature. The results sure that, in case of the presence of self-absorption effect the temperature varies from (1.4067 - 1.2548 eV) as the delay time is varied from 0 to 5 μs. Whereas, in the case of repairing against the effect, it varies from (1.2826 - 0.8961 eV) for the same delay time variation.
Highlights
The laser induced breakdown spectroscopy (LIBS) is a useful technique for elemental analysis of the materials in the form of solids, liquids and gases
El Sherbini et al [14] utilized the diode laser atomic absorption spectroscopy (DLAAS) technique to assess the degree of optical opacity of plasmas at the wavelength of the Hα-line by focusing a 6 ns Nd:YAG laser pulse at 1064 nm on different solid targets material including aluminum target
We report the spectroscopic studies of the plasma generated at the surface of alumina (Al) by the fundamental (1064 nm) of a Q-switched Nd:YAG laser
Summary
The laser induced breakdown spectroscopy (LIBS) is a useful technique for elemental analysis of the materials in the form of solids, liquids and gases. It has a variety of applications like material analysis, environmental monitoring, determination of soil contamination, and biomedical studies, etc. The spectrum of the plasma plume is the signature of the chemical species in the sample, and its analysis yields their composition and relative abundance It depends on several parameters, including target features (physical and chemical), ambient medium properties (plus-width), wavelength, spot size, and laser energy [4] [5]. El Sherbini et al [14] utilized the diode laser atomic absorption spectroscopy (DLAAS) technique to assess the degree of optical opacity of plasmas at the wavelength of the Hα-line by focusing a 6 ns Nd:YAG laser pulse at 1064 nm on different solid targets material including aluminum target
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