Examination of argon metastable atom velocity distribution function close to a conducting wall
Examination of argon metastable atom velocity distribution function close to a conducting wall
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靠近导电壁的氩亚稳态原子速度分布函数的检查
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
F. Doveil
中科院分区：
文献类型：
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作者：
N. Claire;S. Mazouffre;C. Rebont;F. Doveil
用激光诱导荧光（LIF）光谱法记录了金属壁鞘层和鞘层前区域中155亚稳氩原子速度分布函数的空间演化。根据实测数据计算了亚稳态氩原子温度和流体速度。由于亚稳氩原子在与表面碰撞后的损失，原子温度在接近壁面时似乎降低，速度似乎增加。根据亚稳氩原子分布函数的变化，仔细检查和解释了这些伪影。此外，原子的非弹性反射系数由原子向外和向内的通量与表面的比值计算得到。这项研究表明，只有不到1%的亚稳态原子在与金属壁的碰撞中幸存下来。
The spatial evolution of the 1s5 metastable argon atom velocity distribution function is recorded in the sheath and pre-sheath regions of a metallic wall using laser induced fluorescence (LIF) spectroscopy. Metastable argon atom temperature and fluid velocity are computed from measured data. Owing to the loss of metastable argon atom after a collision with the surface, the atom temperature seemingly decreases and the velocity increases when approaching the wall. These artifacts are carefully examined and explained in terms of changes in the metastable argon atom distribution function. In addition, the atom nonelastic reflection coefficient is computed from the ratio of outward to inward atom flux to the surface. This study indicates less than 1% of metastable atoms survive a collision with the metallic wall.