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Spectral studies of nanosecond laser interaction with magnesium sulfate target in air

Published online by Cambridge University Press:  13 December 2013

Muhammad Salik ,
Muhammad Hanif ,
Jiasheng Wang  and
Xi-Qing Zhang
Muhammad Salik*
Affiliation:
School of Science, Department of Physics, Beijing Jiaotong University, 100044 Beijing, China
Muhammad Hanif
Affiliation:
MCS (National University of Sciences and Technology), 46000 Rawalpindi, Pakistan
Jiasheng Wang
Affiliation:
School of Science, Department of Physics, Beijing Jiaotong University, 100044 Beijing, China
Xi-Qing Zhang
Affiliation:
School of Science, Department of Physics, Beijing Jiaotong University, 100044 Beijing, China
*
†Email address for correspondence: [email protected]
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Abstract

The optical emission characterization of the plasma-assisted pulsed laser ablation of the magnesium sulfate target is discussed in this study. The emission spectrum produced by the magnesium sulfate plasma in the wavelength range 200–700 nm has been carefully investigated for different experimental conditions. The spectra analysis was performed by assuming the local thermodynamic equilibrium (LTE) approximation and calculating the plasma temperature with the Boltzmann plot method using neutral Mg spectral lines. The plasma temperature was obtained for different positions along the expansion axis, which allowed obtaining the electron population distribution as a function of the distance from the target. The plasma temperature along the expansion axis allowed evaluating the evolution of the excited states population when the plume expands. Moreover, the Stark broadening method has been employed for electron number density measurements. In this study, the Stark width of the Mg (I) spectral line at 285.21 nm was used. Besides, we have studied the variation of electron temperature (Te) and electron number density (Ne) as a function of laser irradiance.

Type
Papers
Information
Journal of Plasma Physics , Volume 80 , Issue 1 , February 2014 , pp. 67 - 80
Copyright
Copyright © Cambridge University Press 2013 

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