Abstract In the field of analytical chemistry, the dielectric barrier discharge (DBD) is a widely used tool for trace element detection. Due to the good optical accessibility of the plasma in most DBD devices, one way to detect elements is optical emission spectrometry. Moreover, by means of temporally resolved optical emission spectrometry, the periodicity of the DBD can be utilized in order to get insight into the evolution of the plasma emission. Serving as analyte, tellurium was introduced into a capillary DBD via hydride generation. Temporally resolved broad band spectra of the discharge were recorded with an ICCD-camera coupled to a spectrograph. This enables to simultaneously track the emission of several plasma species along the discharge cycle. The maximum emission signal from tellurium was significantly delayed to the emission of the discharge gas helium and the hydrogen background. By means of the recorded broad band spectra it was shown that the ratio of two selected tellurium lines changed during the discharge cycle, which also resulted in different signal to noise ratios for both lines. The knowledge of the point in time at which optimal conditions for the signal to background ratio was achieved enabled to record a clear spectrum of the tellurium lines without additional background subtraction.

中文翻译：

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氢化物生成后毛细管介质阻挡放电中碲发射线的时间演变

摘要 在分析化学领域，介质阻挡放电（DBD）是一种广泛使用的痕量元素检测工具。由于在大多数 DBD 设备中等离子体具有良好的光学可及性，因此检测元素的一种方法是发射光谱法。此外，通过时间分辨光学发射光谱法，可以利用 DBD 的周期性来深入了解等离子体发射的演变。作为分析物，碲通过氢化物生成被引入毛细管 DBD。用耦合到光谱仪的 ICCD 相机记录放电的时间分辨宽带光谱。这使得能够沿着放电循环同时跟踪几种等离子体物质的发射。碲的最大发射信号明显延迟到放电气体氦和氢背景的发射。通过记录的宽带光谱表明，在放电循环期间，两条选定的碲线的比率发生了变化，这也导致两条线的信噪比不同。了解实现信号与背景比的最佳条件的时间点能够记录清晰的碲谱线，而无需额外的背景扣除。