Imaging spectroscopy of polymer ablation plasmas for laser propulsion applications

Imaging spectroscopy of polymer ablation plasmas for laser propulsion applications
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用于激光推进应用的聚合物烧蚀等离子体的成像光谱

DOI:
10.1063/1.4973697
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发表时间:
2017-01
影响因子:
3.2
通讯作者:
Honghao Ma
Honghao Ma
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Benjamin S. Truscott;Hao Liu;Michael N. R. Ashfold;Honghao Ma

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许多聚合物已被提议用作基于激光烧蚀的空间发射和推进器应用中的推进剂,尽管先前很少有研究评估它们在代表高层大气的背景压力下的性能,或研究它们与空气以外的环境气体的相互作用。在这里,我们使用空间和时间分辨光学发射光谱来比较三种聚合物,聚乙烯、聚甲醛和缩水甘油叠氮聚合物,在低于1 托的压力下,使用532 nm、纳秒脉冲激光在Ar和O2中烧蚀。在每种情况下都观察到了中性原子和正电荷原子的发射线,以及等离子体羽流和背景气体相互作用前沿的复合辐射。根据聚合物主链的结构,C2自由基要么以直接裂解产物的形式出现,要么以C原子的三体复合方式出现,并表现出≈5000 K的旋转温度。
A number of polymers have been proposed for use as propellants in space launch and thruster applications based on laser ablation, although few prior studies have either evaluated their performance at background pressures representative of the upper atmosphere or investigated interactions with ambient gases other than air. Here, we use spatially and temporally resolved optical emission spectroscopy to compare three polymers, poly(ethylene), poly(oxymethylene), and glycidyl azide polymer, ablated using a 532 nm, nanosecond pulsed laser under Ar and O2 at pressures below 1 Torr. Emission lines from neutrally and positively charged atoms are observed in each case, along with the recombination radiation at the interaction front between the plasma plume and the background gas. C2 radicals arise either as a direct fragmentation product or by a three-body recombination of C atoms, depending on the structure of the polymer backbone, and exhibit a rotational temperature of ≈5000 K. The Sedov–Taylor point blast mode...
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