A dc glow discharge as a source of electrons for a portable mass spectrometer: characterization of the electron current intensity and electron kinetic energy distribution
A dc glow discharge as a source of electrons for a portable mass spectrometer: characterization of the electron current intensity and electron kinetic energy distribution
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DOI：
10.1088/0963-0252/24/1/015001
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发表时间：
2015-02-01
影响因子：
3.8
通讯作者：
Taylor, S.
中科院分区：
文献类型：
--
作者：
Chalkha, A.;Despenes, C.;Taylor, S.
具有平面电极的直流辉光放电电池的工作温度约为1Torr，其特征是具有来自环境空气的入口气流。在便携式质谱仪中，它将被用作电子来源，通过电子碰撞进一步电离分子。帕森曲线已经测量了曲线最小值附近的六个压力值。在正常辉光区域，电压-电流特性随着电流的增加而增加，直到7 mA的不同压力值。对于不同的绝缘子材料，在超过一天的较长时间内记录了放电电流的时间演变。MACOR和尼龙的稳定性最好。测得电离的有效电子电流约为0.6微安，电子动能分布在0到几十eV之间。
A dc glow discharge cell with planar electrodes operating at about 1 Torr has been characterized with an inlet flow from ambient air. It will be used as a source of electrons to further ionize molecules by electron impact in a portable mass spectrometer.The Paschen curve has been measured for six values of the pressure around the minimum of the curve. The voltage-current characteristic, observed until 7 mA for different values of the pressure, increases with current in the normal glow regime. The temporal evolution of the discharge current has been recorded over long periods greater than one day for different insulator materials. The best stability has been obtained with Macor and Nylon. The available electron current for ionization has been measured at about 0.6 mu A and the electron kinetic energy distribution has been found to be between 0 and a few tens of eV.