Investigations on the afterglow of a thin cathode discharge in argon at atmospheric pressure
Investigations on the afterglow of a thin cathode discharge in argon at atmospheric pressure
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大气压下氩气中薄阴极放电余辉的研究
DOI：
10.1088/0022-3727/43/29/295201
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
U. Czarnetzki
中科院分区：
文献类型：
--
作者：
S. Mohr;D. Luggenhölscher;U. Czarnetzki
薄阴极放电由两个电极组成，两个电极被厚度约为100 µm的介电层隔开。阳极的形状可以任意选择，而阴极的厚度也约为100 µm。通过这个“孔”，钻一个直径为200 µm的孔。当这样的装置在几百百帕的压力下工作时，它表现出一种自脉冲行为，其中达到了几十16 cm-3的高电子密度。电气测量表明，这可以解释为一个短暂的火花放电的重复点火。由于高压和相关的高碰撞频率，这种放电的余辉预计将持续几十纳秒。相反，观察到了几百纳秒的寿命。为了确定这种长寿余辉的机制，余辉的动力学模型的开发。结果发现，潘宁电离、与激发态原子和准分子的超弹性碰撞在电子的产生和加热中起着至关重要的作用。
A thin cathode discharge consists of two electrodes separated by a dielectric layer with a thickness of ca 100 µm. The shape of the anode can be chosen arbitrarily, while the thickness of the cathode is also about 100 µm. Through this' sandwich', a hole with a diameter of 200 µm is drilled. When such a device is operated at pressures of several hundred hectopascals, it shows a self-pulsing behaviour in which high electron densities of several 10 16 cm− 3 are reached. Electrical measurements showed that this can be explained by the repeated ignition of a short-living spark discharge. Due to the high pressure and the related high collision frequencies, the afterglow of this discharge was expected to last several tens of nanoseconds. Instead, lifetimes of several hundred nanoseconds were observed. In order to identify the mechanisms responsible for this long living afterglow, a kinetic model of the afterglow was developed. As a result, Penning ionization, superelastic collisions with both atoms in excited states and excimers were found to play a crucial role in the production and heating of electrons.
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