Design and optimization of a corona discharge ionization source for ion mobility spectrometry
Design and optimization of a corona discharge ionization source for ion mobility spectrometry
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DOI：
10.1063/1.1150618
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发表时间：
2000-06-01
影响因子：
1.6
通讯作者：
Taj, N
中科院分区：
文献类型：
--
作者：
Tabrizchi, M;Khayamian, T;Taj, N
在这项工作中，研究了在离子迁移谱测定中使用电晕放电作为电离源的可能性。空气中正极性和负极性的结果与 Townsend 公式一致，该公式指出 I/V 是 V 的线性函数。还研究了电晕离子的分布曲线，并与 Ni-63 电离源的分布曲线进行了比较。一般来说，从电晕电离源获得的总离子电流比Ni-63源大大约一个数量级，这导致更好的灵敏度和更高的信噪比。记录空气的正、负光谱，并将丙酮和甲基膦酸二甲酯的正光谱与Ni-63的正光谱进行比较。在负模式下，除了反应物离子的峰外，还观察到了许多新峰，这些峰主要是由电晕放电形成的氮氧化物造成的。通过增加电极间距可以最小化这个问题。 (C) 2000 年美国物理研究所。 [S0034-6748(00)02806-9]。
In this work the possibility of using corona discharge as an ionization source in ion mobility spectrometry has been investigated. The results for both positive and negative polarity in air are consistent with the Townsend formula which states that I/V is a linear function of V. The distribution profile of the corona ions has also been investigated and compared with that of the Ni-63 ionization source. Generally, the total ion current obtained from the corona ionization source was greater than that of the Ni-63 source by about an order of magnitude, which results in a better sensitivity and a higher signal-to-noise ratio. The positive and negative spectra of air were recorded and the positive spectra of acetone and dimethylmethyl-phosphonate were compared with that of Ni-63. In the negative mode, a number of new peaks, apart from those of reactant ions, were observed which are mainly due to nitrogen oxides, formed by corona discharge. This problem was minimized by increasing the interdistance of the electrodes. (C) 2000 American Institute of Physics. [S0034-6748(00)02806-9].