LXXIX. Ionization by collision in helium
LXXIX. Ionization by collision in helium
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六十九。
DOI：
10.1080/14786440508637279
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发表时间：
1912
期刊：
影响因子：
--
通讯作者：
F. B. Pidduck
中科院分区：
文献类型：
--
作者：
E.W.B. Gill B.Sc.;F. B. Pidduck
由JS Townsend教授提出的气体碰撞电离理论，已经对大量气体T进行了实验验证，其中包括氦$。在作者用氦做的第一次实验中，气体不是很纯净（可能有2%的杂质存在），有充分的理由认为，这些微量的杂质对离子的电离能力产生了相当大的影响。当时进行了一些实验，在气体被泵入含有木炭的房间并浸泡在液态空气中后进行了净化。当时液体空气的供应是有限的，只得到了一些结果，但这些结果足以表明，与存在的量相比，杂质产生了非常大的影响。负离子和正离子的电离力都增加了，特别是正离子的电离力增加了，结果必然降低了最小火花电位。它实际上从232伏降低到203伏，据推测，对于绝对纯净的气体，它不会低于190伏。
T HE theory of the ionization of gases by collision, due to Professor JS Townsend, has been experimentally verified for a large number of gases t, among them being helium $. In the first experiments made by the authors with helium, the gas was not quite pure (probably about 2 per cent. of impurity being present) and there was good reason for supposing that these slight traces of impurity exercised a very considerable effect upon the ionizing powers of the ions. A few experiments were performed at the time, after the gas had been purified by pumping into a chamber containing charcoal and immersed in liquid air. The supply of liquid air was then limited and only a few results were obtained, but they were sufficient to show that the impurities exercised an effect which was very large in comparison with the amount present.The ionizing powers of both negative and positive ions, especially the latter, were increased, and as a necessary result the minimum sparking potential was lowered. It was actually reduced front 232 volts to 203, and it was conjecturcd that for absolutely pure gas it would be not lower than 190 volts.