Abstract Choosing a suitable power supply concerning the shape of the excitation voltage and the type of discharge gas for elemental analysis with a dielectric barrier discharge is not trivial. Both significantly affect the analyte signal. By means of conventional methods such as inductively coupled plasma mass spectrometry or atomic absorption spectrometry optimal conditions can be found, however the reason why the specific parameter set results in ideal signals is hidden in the detailed characteristics of the DBD. These phenomena occur on a narrow time scale of nanoseconds to microseconds and are challenging to observe. Therefore, the emission profiles of tin in a planar dielectric barrier discharge atomizer were studied by means of temporally and spatially resolved optical emission spectroscopy by varying the type of discharge gas and the shape of the excitation voltage. The latter was realized by applying either a sinusoidal or a square wave power supply. The temporally resolved emission profile showed that in case of sinusoidal excitation the power is distributed over a longer time in several discharge events, whereas with square wave excitation the power is coupled to the dielectric barrier discharge in one intensive pulse. The spatially resolved emission signals indicated a different point of excitation of Sn within the dielectric barrier discharge for each power source. The Sn emission in a plasma, which was sustained by the square wave power supply, was not significantly influenced by the change of the discharge gas from argon to helium. However, for the emission signal in a plasma excited by the sinusoidal power supply, helium had an adverse effect.

中文翻译：

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电压形状和放电气体对平面介质阻挡放电中锡的时间和空间分辨发射特性的影响

摘要 根据激发电压的形状和放电气体的类型来选择合适的电源进行介质阻挡放电的元素分析并非易事。两者都显着影响分析物信号。通过电感耦合等离子体质谱法或原子吸收光谱法等常规方法可以找到最佳条件，但是特定参数集导致理想信号的原因隐藏在DBD的详细特征中。这些现象发生在纳秒到微秒的狭窄时间尺度上，并且难以观察。所以，通过改变放电气体的类型和激发电压的形状，通过时间和空间分辨的光学发射光谱研究了平面介质阻挡放电雾化器中锡的发射曲线。后者是通过应用正弦或方波电源来实现的。时间分辨的发射剖面显示，在正弦激发的情况下，功率在多次放电事件中分布在更长的时间内，而对于方波激发，功率在一个强脉冲中耦合到介质阻挡放电。空间分辨的发射信号表明每个电源的电介质阻挡放电内的 Sn 激发点不同。由方波电源维持的等离子体中的 Sn 发射，放电气体从氩气到氦气的变化没有显着影响。然而，对于由正弦电源激发的等离子体中的发射信号，氦气具有不利影响。