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Influence of CO2 pressure on the emission spectra and plasma parameters in underwater laser-induced breakdown spectroscopy

机译：水下激光诱导击穿光谱中二氧化碳压力对发射光谱和等离子体参数的影响

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Optical emission spectroscopic studies have been carried out to investigate the pressure effect of CO2 on laser-produced underwater plasma. The plasma was generated by focusing 1064 nm, 6 ns pulses from a Nd:YAG laser in a CO2-bearing solution. The temporal evolution of the continuum emission, Sr and Ba lines, and plasma electron density and temperature was characterized under CO2 pressure ranging from 10 to 300 bars. The electron density measurements were made using the Stark broadening of the 455.40 nm Ba II line, while the temperature measurements have been performed by the Saha-Boltzmann method using the Sr I-II lines at 460.73 and 407.77 nm, respectively. It was found that CO2 pressure has little effect on the emission line intensity and signal-to-background ratio. The electron density and the temperature are found to be independent of the CO2 pressure at early times. When time becomes longer, the electron density exhibits an appreciable rise as the CO2 pressure increases, while the temperature is found to be unchanged. (C) 2016 Optical Society of America
机译：已经进行了光发射光谱研究以研究CO 2对激光产生的水下等离子体的压力作用。通过将Nd：YAG激光器中的1064 nm，6 ns脉冲聚焦在含CO2的溶液中来生成等离子体。在10至300 bar的CO2压力下，表征了连续发射，Sr和Ba线的时间演变以及等离子体电子密度和温度。电子密度测量是使用455.40 nm Ba II谱线的Stark展宽进行的，而温度测量是通过Saha-Boltzmann方法使用Sr I-II谱线分别在460.73和407.77 nm进行的。发现CO 2压力对发射线强度和信噪比几乎没有影响。在早期发现电子密度和温度与CO2压力无关。当时间变长时，随着CO2压力的增加，电子密度会出现明显的上升，而温度却保持不变。 （C）2016美国眼镜学会

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