Abstract
In this work, the Al-Mg alloys plasma plume that produced under vacuum (10-1 torr) by Nd:Yag Laser was studied. the plasma spectra were analyzed by comparing the atomic lines of Al and Mg lines with standard lines. The effect of laser energies on spectral lines produced by laser ablation were investigated using optical spectroscopy .several plasma characteristics like electron temperature, electron density, Debye�s length, plasma frequency and number of particles in the ��Debye�s Sphere�� were calculated in vacuum .The results show the electron temperature and electron density increase in magnesium, aluminum and magnesium :aluminum alloy targets . It was found that the lines intensities at different laser peak powers increase when the laser peak power increases then decreases when the power continues to increase.
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