Atomization of arsenic hydride in a planar dielectric barrier discharge: Behavior of As atoms studied by temporally and spatially resolved optical emission spectrometry
Atomization of arsenic hydride in a planar dielectric barrier discharge: Behavior of As atoms studied by temporally and spatially resolved optical emission spectrometry
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DOI：
10.1016/j.sab.2018.12.006
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
S. Burhenn;J. Kratzer;F. Klute;J. Dědina;J. Franzke
中科院分区：
文献类型：
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作者：
S. Burhenn;J. Kratzer;F. Klute;J. Dědina;J. Franzke
采用具有时间和空间分辨率的发射光谱法研究了砷原子在具有溅射栅格电极的平面介质阻挡放电（DBD）雾化器中的激发机理。由于电极的形状，DBD设计不仅在端对位置，而且在侧对方向上提供对等离子体的光学访问。通过与单色仪耦合的纳秒级时间分辨率的iCCD相机，表明等离子体发射的时空发展取决于放电气体（Ar, He）的性质。氩气会形成致密的等离子体灯丝，而氦气则会点燃均匀得多的等离子体。采用氢化物生成引入分析物的方法，研究了两个等离子体对砷原子发射信号的影响。砷的激发在时间上跟随氦或氩的发射信号，并分布在整个放电体积中。基本的放电传播动力学与先前在毛细管DBD中得到的OES结果相似。
The excitation mechanism of arsenic atoms in a planar shaped dielectric barrier discharge (DBD) atomizer with sputtered grid shaped electrodes was studied by optical emission spectrometry (OES) with resolution in time and space. Due to the shape of the electrodes, the DBD design provides optical access to the plasma not only in end-on position but also in side-on direction. By means of an iCCD camera with nanosecond time resolution coupled to a monochromator it was shown that the spatial and temporal development of the plasma emission depends on the discharge gas nature (Ar, He). Applying argon, a dense and constricted plasma filament is formed, whereas in helium a much more homogeneous plasma is ignited. The impact of both plasmas on the emission signal of arsenic atoms was studied employing analyte introduction via hydride generation. The excitation of arsenic temporally follows the emission signal of helium or argon and is spread across the whole discharge volume. The basic discharge propagation dynamics showed similarities to previously presented results obtained by OES in a capillary DBD.