Capillary Dielectric Barrier Discharge: Transition from Soft Ionization to Dissociative Plasma.
Capillary Dielectric Barrier Discharge: Transition from Soft Ionization to Dissociative Plasma.
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DOI：
10.1021/acs.analchem.5b04605
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发表时间：
2016-04
影响因子：
7.4
通讯作者：
F. Klute;A. Michels;A. Schütz;C. Vadla;V. Horvatić;J. Franzke
中科院分区：
文献类型：
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作者：
F. Klute;A. Michels;A. Schütz;C. Vadla;V. Horvatić;J. Franzke
研究了毛细管氦介质阻挡放电作为软电离源和离解电离源的性能。等离子体发射的时空测量结果表明，在一个电压占空比的等离子体从一个软的离解电离源。在最早的时间，软等离子体产生之间的电极以及外部的毛细管形成等离子体射流。其特征在于仅由He和N2（+）产生的显著辐射，已知这在分析物的软电离过程中是重要的。后来，能够解离分子的等离子体发展起来。它的特点是可观的辐射从分析物的解离产物，并限制在电极间区域的毛细管。因此，为了软电离的目的，将分析物专门引入等离子体射流中是可行的。对于元素分析，电极间等离子体是合适的。
A capillary He dielectric barrier discharge was investigated with respect to its performance as a soft or dissociative ionization source. Spatiotemporal measurements of the plasma emission showed that in one voltage duty cycle the plasma evolved from a soft to dissociative ionization source. At the earliest time, the soft plasma was generated between the electrodes as well as outside the capillary forming the plasma jet. It was characterized by significant radiation arising only from He and N2(+), which are known to be important in the process of the soft ionization of the analyte. Later in time, the plasma capable of dissociating molecules develops. It is characterized by appreciable radiation from analyte dissociation products and is restricted to the interelectrode region in the capillary. Thus, for the soft ionization purposes, it is feasible to introduce the analyte exclusively in the plasma jet. For elemental analysis, the interelectrode plasma is appropriate.