Discharge from hot CaO.
Discharge from hot CaO.
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DOI：
10.1103/physrevseriesi.32.492
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发表时间：
1911-05-01
期刊：
影响因子：
--
通讯作者：
Child, CD
中科院分区：
文献类型：
--
作者：
Child, CD
根据迈尔斯的说法，将有二。2）在这些压力和温度条件下，每cc的分子数为10。由此我们发现每个分子平均每48000秒被击中一次，或者每13小时一次，当条件适合时，只需要几分之一秒就可以产生发光放电。当然，这并不是反对在发光放电开始后通过重复碰撞进行电离的论点，因为那时电子的数量会大得多，但是这种碰撞的想法被纳尔逊用来解释发光放电的开始，这是一个反对这种解释的论点。然而，稍后会给出其他数据，表明并非在任何时候都存在重复撞击造成的电离。临界条件不取决于电流的大小，而取决于阴极的状态。第二，实验表明，从不发光放电到发光放电所需的电压，即使有，也与流过的电流量有很小的关系，而与阴极的种类和条件有很大的关系。也就是说，通过电子管并击中分子的电子数量并不能决定变化发生的点，而其他条件则可以。
According to Myers' there will be II. 2)(Io molecules per cc under these condition of pressure and temperature. From this we find that each molecule will on the average behit once in 48, ooo sec., or once in thirteen hours, and it only requires a fraction of a second to produce the luminous discharge when the conditions are right for it.This is, of course, not an argument against ionization by repeated impact after the luminous discharge has commenced, for thenthe number of electrons will be very much greater, but the idea of such impact was used by Thomsonas an explanation of the beginning of the luminous discharge, and it is an argument against such an explanation. There will, however, be other data given later which indicate that not at any time is there ionization by repeated impact. Critical Condition Doesnot Depend on the Amount of CNrrent, but on the Condition of the Cathode.—In the second place experiments indicate that the voltage required to change from the non-luminous to the luminous discharge depends but slightly, if at all, on the amount of current flowing, but does depend very greatly onthe kind and condition ofthe cathode. That is, the number of electrons passing through the tube and hitting upon the molecules does not determine the point where the change occurs, while other conditions do.