射频氢/氩等离子体中热氢催化产生的证据
Evidence of catalytic production of hot hydrogen in rf generated hydrogen/argon plasmas
摘要：
本文在一个大的GEC池（36 cm长，14 cm内径）中，绘制了纯H_2和Ar/H_2混合气体中氢原子谱线的选择性展宽随位置、H_2/Ar比、时间、功率和压强的变化曲线。关于选择性谱线增宽的几个观察结果特别值得注意，因为它们是基于早期模型所未预料到的。首先，发现巴耳末线的异常加宽存在于整个等离子体中，而不仅仅是在电极之间的区域中。第二，加宽始终是操作参数的复杂函数，特别是气体组成（最高纯H2）、位置、功率、时间和压力。显然，早期模型没有预料到的是，在某些条件下，在入口端发现了最高浓度的“热”（>10 eV）氢，而不是在电极之间的高场区域，在其他条件下，最热的H在（出口）泵（也是接地电极）端。第三，激发和电子温度小于一个电子伏特的所有区域的等离子体不直接相邻（> 1毫米）的电极，提供额外的证据表明，能量加宽，相反的标准模型，是不是从外地获得。第四，与我们早期对氢/氦和水等离子体的研究相反，我们发现在某些条件下，整个GEC型电池中98%的原子氢处于“热”状态。几乎每一个操作参数的研究影响的性质的热H原子的人口，显然存在二阶和三阶效应，表明需要实验设计。概述了产生热氢原子的一些非场机制，特别是Mills的CQM模型所提出的机制。
英文摘要：
In this paper the selective broadening of the atomic hydrogen lines in pure H2 and Ar/H2 mixtures in a large 'GEC' cell (36 cm length_ 14 cm ID) was mapped as a function of position, H2/Ar ratio, time, power, and pressure. Several observations regarding the selective line broadening were particularly notable as they are unanticipated on the basis of earlier models. First, the anomalous broadening of the Balmer lines was found to exist throughout the plasma, and not just in the region between the electrodes. Second, the broadening was consistently a complex function of the operating parameters particularly gas composition (highest in pure H2), position, power, time and pressure. Clearly not anticipated by earlier models were the findings that under some conditions the highest concentration of 'hot' (>10 eV) hydrogen was found at the entry end, and not in the high field region between the electrodes and that in other conditions, the hottest H was at the (exit) pump (also grounded electrode) end. Third, excitation and electron temperatures were less than one eV in all regions of the plasma not directly adjacent (>1mm) to the electrodes, providing additional evidence that the energy for broadening, contrary to standard models, is not obtained from the field. Fourth, in contrast to our earlier studies of hydrogen/helium and water plasmas, we found that in some conditions 98% of the atomic hydrogen was in the 'hot' state throughout the GEC-type cell. Virtually every operating parameter studied impacted the character of the hot H atom population, and clearly second and third order effects exist, indicating a need for experimental design. Some non-field mechanisms for generating hot hydrogen atoms, specifically those suggested by Mills' CQM model, are outlined.
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