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首页> 外文期刊>Spectrochimica Acta, Part B. Atomic Spectroscopy >Time-resolved measurement of emission profiles in pulsed radiofrequency glow discharge optical emission spectroscopy: Investigation of the pre-peak
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Time-resolved measurement of emission profiles in pulsed radiofrequency glow discharge optical emission spectroscopy: Investigation of the pre-peak

机译：脉冲射频辉光放电光发射光谱法中发射曲线的时间分辨测量：峰前研究

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摘要

Radiofrequency glow discharge coupled to optical emission spectroscopy has been used in pulsed mode in order to perform a detailed study of the measured temporal emission profiles for a wide range of copper transitions. Special attention has been paid to the early emission peak (or so-called pre-peak), observed at the beginning of the emission pulse profile. The effects of the important pulse parameters such as frequency, duty cycle pulse width and power-off time, have been studied upon the Cu pulse emission profiles. The influence of discharge parameters, such as pressure and power, was studied as well. Results have shown that the intensity observed in the pre-peak can be 10 times as large as the plateau value tor resonant lines and up to 5 times in case of transitions to the metastable levels. Increasing pressure or power increased the pre-peak intensity while its appearance in time changed. The pre-peak decreased when the discharge off-time was shorter than 100 μs. According to such results, the presence of the pre-peak could be probably due to the lack of self-absorption during the first 50 μs, and not to the ignition of the plasma. Under the selected operation conditions, the use of the pre-peak emission as analytical signals increases the linearity ot calibration curves for resonant lines subjected to self-absorption at high concentrations.
机译：为了对宽范围的铜跃迁进行测量的时间发射轮廓的详细研究，已在脉冲模式下使用了与光发射光谱耦合的射频辉光放电。已经特别注意了在发射脉冲轮廓开始时观察到的早期发射峰（或所谓的峰前峰）。在铜脉冲发射曲线上已经研究了重要的脉冲参数如频率，占空比脉冲宽度和断电时间的影响。还研究了排放参数（例如压力和功率）的影响。结果表明，在峰前观察到的强度可以是共振线的平台值的10倍，在过渡到亚稳能级的情况下可以达到5倍。压力或功率的增加会增加峰前强度，而其外观随时间变化。当放电关闭时间短于100μs时，前峰降低。根据这样的结果，前峰的存在可能是由于在前50μs内缺乏自吸收，而不是由于等离子体的点燃。在选定的工作条件下，使用峰前发射作为分析信号会增加在高浓度下自吸收的谐振线的线性或校准曲线。

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