Effect of magnetic field on laser induced breakdown spectroscopy of zirconium dioxide (ZrO 2 ) plasma
Effect of magnetic field on laser induced breakdown spectroscopy of zirconium dioxide (ZrO 2 ) plasma
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DOI：
10.1016/j.ijleo.2017.04.046
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发表时间：
2017-07
期刊：
影响因子：
3.1
通讯作者：
S. Waheed;S. Bashir;Asadullah Dawood;S. Anjum;M. Akram;Asma Hayat;Saba Amin;A. Zaheer
中科院分区：
文献类型：
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作者：
S. Waheed;S. Bashir;Asadullah Dawood;S. Anjum;M. Akram;Asma Hayat;Saba Amin;A. Zaheer
研究了zro2等离子体在有磁场和无磁场条件下的激光诱导击穿光谱。采用Nd: YAG激光器（1064 nm, 10 ns），在压力为100 Torr的氩气环境下，在6.4 ~ 25.6 J cm−2的不同影响下产生等离子体。zro2等离子体的发射强度和电子温度随激光辐照强度的增大而增大，而电子数密度随激光辐照强度的增大而减小。结果表明，在磁场作用下，zro2等离子体的发射强度、电子温度和电子数密度均略高于无磁场条件下。等离子体参数的增加归因于磁约束和焦耳热效应。在没有磁场的情况下，zro2等离子体的电子温度在5345 K ~ 5475 K之间变化不大，而在有磁场的情况下，电子温度在5435 K ~ 5600 K之间升高。同样，在没有磁场的情况下，zro2等离子体的电子数密度变化范围为1.80 × 1018cm−3 ~ 3.50 × 1018cm−3，而在有磁场的情况下，电子数密度变化范围为1.75 × 1018cm−3 ~ 4.25 × 1018cm−3。通过对等离子体参数β的分析评估，证实了磁约束效应的存在，在所有实验条件下，等离子体参数β都小于1。激光通量和磁场对zro2等离子体参数均有显著影响。
Laser induced breakdown spectroscopy of ZrO2plasma in the presence and absence of magnetic field has been investigated. The plasma was generated by employing Nd: YAG laser (1064 nm, 10 ns) at various fluences ranging from 6.4 J cm−2to 25.6 J cm−2under argon environment of pressure of 100 Torr. Both emission intensity and electron temperature show increasing trend with increasing the fluence, whereas, electron number density of ZrO2plasma decreases with increasing the laser fluence. It is revealed that values of emission intensity, electron temperature and electron number density of ZrO2plasma are slightly higher in the presence of magnetic field as compared to field free case at all fluences. This increase in plasma parameters is attributed to magnetic confinement and Joule heating effect. With the variation of fluence the electron temperature of ZrO2plasma varies slightly from 5345 K to 5475 K in the absence of magnetic field, whereas in case of magnetic field this value enhances from 5435 K to 5600 K. Similarly the electron number density of ZrO2plasma varies from 1.80 × 1018cm−3to 3.50 × 1018cm−3in the absence of magnetic field, whereas in case of magnetic field, the variation in electron number density varies from 1.75 × 1018cm−3to 4.25 × 1018cm−3. The existence of magnetic confinement effects is confirmed by the analytical evaluation of plasma parameter β, which is smaller than 1 under all experimental conditions. It is also revealed that both the laser fluence as well as magnetic field significantly influence the ZrO2plasma parameters.