Abstract
In this study, we shall report the spectroscopic studies of the laser induced-Mg plasma in the atmospheric air by a Q-switched Nd-YAG laser operating at its fundamental wavelength of 1062 nm. The plasma was evaluated as a function of distance along the plasma expansion from 0.5-5.5 mm. The electron temperature and the electron number density were determined from the Boltzmann’s plot method and the Stark broadening methods respectively. From our investigations the electron temperature was evaluated to be in the range of 17556-9785 K for the laser energy of 500 mJ and 17341-8946 K with laser energy of 450 mJ. The electron number density was deduced to be from 1.46 × 1017-1.89 × 1017 cm-3 and 1.29 × 1017-1.78×1017 cm-3 respectively. From our evaluations, we observed that the electron temperature and number density decrease along the distance of the plasma expansion, and also increases with increasing laser energy.
Highlights
As a spectroscopic technique, laser induced breakdown spectroscopy (LIBS) have attracted numerous attention in the scientific community for the past decades, due to its potential application in fields such as material processing, biomedical, military, industrial analysis, pharmaceutical studies, and environmental monitoring [1-6]
Laser induced breakdown spectroscopy (LIBS) which is sometimes referred to as laser-induced plasma spectroscopy (LIPS) uses the radiations produced from the plasma as a result of the interaction of the laser with the target material, to analyze qualitatively and quantitatively the elemental composition of the target sample [7]
The emission spectra of the plasma was recorded at different distances along the direction of the plasma expansion with a plasma energies of 400 mJ, 450 mJ and 500 mJ in air at atmospheric pressure as depicted in the Figure 2a-c plasma spectra induced by the laser consists of a strong continuum and ionic lines of the components of the target sample
Summary
Laser induced breakdown spectroscopy (LIBS) have attracted numerous attention in the scientific community for the past decades, due to its potential application in fields such as material processing, biomedical, military, industrial analysis, pharmaceutical studies, and environmental monitoring [1-6]. Laser induced breakdown spectroscopy (LIBS) which is sometimes referred to as laser-induced plasma spectroscopy (LIPS) uses the radiations produced from the plasma as a result of the interaction of the laser with the target material, to analyze qualitatively and quantitatively the elemental composition of the target sample [7]. LIBS hold numerous advantages over other conventional atomic emission spectroscopy techniques: LIBS is applicable to both conducting and non-conducting target sample analysis, and it requires little or no preparation of sample [8-11]. The light is analyzed by the spectrometer, which is used to characterize and investigate the sample composition, electron temperature and number density
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