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Investigation on spatial distribution of optically thin condition in laser-induced aluminum plasma and its relationship with temporal evolution of plasma characteristics

Abstract

The temporal evolutions of doublet lines intensity ratio, plasmas temperature (T) and electron density (Ne) of different radial parts of aluminum plasma and the relationship between optically thin condition and plasma characteristics are investigated. For doublet lines intensity ratio, the optimal delay time (tot) when the plasma is optically thin, is determined by comparing the experimental intensity ratio of doublet Al (I) lines with the theoretical value. The optimal integration time, fiber collection angle, and delay time corresponding to the optically thin condition are 400 ns, 45º, and 500 ns, respectively, in which case the linearity of the calibration curve reaches 0.98 and allows performing more accurate composition measurements. For temperature, the maximum values are reached within 300 ns at 10º, 30º, 45º, and 80º, but after 900 ns at 55º, 60º, and 70º. Combined with morphologic image of the plasma, we infer that the time at which a radial part of plasma reaches the highest temperature is related to the extent of its expansion. Generally, the faster the radial part of plasma expands, the sooner the temperature reaches its maximum. For a radial part of plasma, it may not be in optically thin condition when the corresponding temperature reaches its maximum. If the highest temperature comes earlier, the optically thin condition is likely to appear in the descending stage of the temporal evolution curve of temperature. Otherwise, it may appear in the ascending stage. For electron density, there seems to be no simple positive correlation relationship with optically thin condition.

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Publication details

The article was received on 05 May 2017, accepted on 19 Jun 2017 and first published on 19 Jun 2017


Article type: Paper
DOI: 10.1039/C7JA00175D
Citation: J. Anal. At. Spectrom., 2017, Accepted Manuscript
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    Investigation on spatial distribution of optically thin condition in laser-induced aluminum plasma and its relationship with temporal evolution of plasma characteristics

    J. Hou, L. Zhang, W. Yin, Y. Zhao, W. Ma, L. Dong, G. Yang, L. Xiao and S. Jia, J. Anal. At. Spectrom., 2017, Accepted Manuscript , DOI: 10.1039/C7JA00175D

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