Dynamics of C2 formation in laser-produced carbon plasma in helium environment
Dynamics of C2 formation in laser-produced carbon plasma in helium environment
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DOI：
10.1063/1.3555679
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发表时间：
2011-03
影响因子：
3.2
通讯作者：
K. F. Al-Shboul;S. S. Harilal-S.;A. Hassanein;M. Polek
中科院分区：
文献类型：
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作者：
K. F. Al-Shboul;S. S. Harilal-S.;A. Hassanein;M. Polek
我们研究了氦环境气体在激光产生的碳等离子体中C2物质形成动力学中的作用。等离子体是通过将Nd:YAG激光器发出的1064 nm脉冲聚焦到碳靶上产生的。利用发射光谱、光谱分辨和集成快速成像技术研究了C2的发射特性。我们的结果表明，等离子体羽流中C2的形成受到He气体压力的强烈影响。在真空条件下，C2发射区位于靶区附近，且随着He压力的增大，C2强度在轴向和径向均出现振荡。膨胀羽流中C2强度在高压下的振荡可能是由碳二聚体的不同形成区引起的。
We investigated the role of helium ambient gas on the dynamics of C2 species formation in laser-produced carbon plasma. The plasma was produced by focusing 1064 nm pulses from an Nd:YAG laser onto a carbon target. The emission from the C2 species was studied using optical emission spectroscopy, and spectrally resolved and integrated fast imaging. Our results indicate that the formation of C2 in the plasma plume is strongly affected by the pressure of the He gas. In vacuum, the C2 emission zone was located near the target and C2 intensity oscillations were observed both in axial and radial directions with increasing the He pressure. The oscillations in C2 intensity at higher pressures in the expanding plume could be caused by various formation zones of carbon dimers.