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首页> 外文期刊>Plasma Sources Science & Technology >Absolute atomic oxygen density measurements by two-photon absorption laser-induced fluorescence spectroscopy in an RF-excited atmospheric pressure plasma jet
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Absolute atomic oxygen density measurements by two-photon absorption laser-induced fluorescence spectroscopy in an RF-excited atmospheric pressure plasma jet

机译：在射频激发的大气压等离子体射流中通过双光子吸收激光诱导的荧光光谱法测量绝对原子氧密度

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摘要

The atmospheric pressure plasma jet is a capacitively coupled radio frequency discharge (13.56 MHz) running with a high helium flux (2 m(3) h(-1)) between concentric electrodes. Small amounts (0.5%) of admixed molecular oxygen do not disturb the homogeneous plasma discharge. The jet effluent leaving the discharge through the ring-shaped nozzle contains high concentrations of radicals at a low gas temperature-the key property for a variety of applications aiming at treatment of thermally sensitive surfaces. We report on absolute atomic oxygen density measurements by two-photon absorption laser-induced fluorescence (TALIF) spectroscopy in the jet effluent. Calibration is performed with the aid of a comparative TALIF measurement with xenon. An excitation scheme (different from the one earlier published) providing spectral matching of both the two-photon resonances and the fluorescence transitions is applied.
机译：大气压等离子体射流是电容耦合的射频放电（13.56 MHz），在同心电极之间以高氦通量（2 m（3）h（-1））运行。少量（0.5％）的混合分子氧不会干扰均匀的等离子体放电。通过环形喷嘴排出的射流在较低的气体温度下含有高浓度的自由基，这是各种针对热敏表面处理的应用的关键特性。我们报告通过喷射流中的两光子吸收激光诱导的荧光（TALIF）光谱学测量绝对原子氧密度。借助氙气进行的TALIF比较测量进行校准。使用一种激发方案（与先前发表的方案不同），该方案提供了两个光子共振和荧光跃迁的光谱匹配。

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