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首页> 外文期刊>Journal of Analytical Sciences, Methods and Instrumentation >Measurements of Absolute Atomic Nitrogen Density by Two-Photon Absorption Laser-Induced Fluorescence Spectroscopy in Hot Air Plasma Generated by Microwave Resonant Cavity
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Measurements of Absolute Atomic Nitrogen Density by Two-Photon Absorption Laser-Induced Fluorescence Spectroscopy in Hot Air Plasma Generated by Microwave Resonant Cavity

机译：微波谐振腔产生的热空气等离子体中双光子吸收激光诱导的荧光光谱法测量绝对原子氮密度

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For the first time, absolute densities of atomic nitrogen in its ground state style="font-family:;" "=""> style="font-family:Verdana;">( style="font-family:Verdana;">N style="font-family:Verdana;">4 style="font-family:Verdana;">S) have been measured in hot dry and humid air plasma columns under post-discharge regime. The determination of space-resolved absolute densities leads to obtain the dissociation degrees of molecular nitrogen in the plasma. The hot plasmas are generated inside an upstream gas-conditioning cell at 600 mbar when the air gas flow is directly injected at 10 slm in a microwave resonant cavity (2.45 style="font-family:;" "=""> style="font-family:;" "=""> style="font-family:Verdana;">GHz, 1 kW) placed in the downstream side. Density measurements based on laser induced fluorescence spectroscopy with two-photon excitation (TALIF), are more particularly performed along the radial and axial positions of the plasma column. Calibration of TALIF signals is performed style="font-family:Verdana;">in situ style="font-family:Verdana;"> ( style="font-family:Verdana;">i.e. style="font-family:Verdana;"> in the same gas-conditioning cell but without plasma) using an air gas mixture containing krypton. Optical emission spectroscopy is considered to estimate the rotational gas temperature by adding a small amount of H style="font-family:Verdana;">2 style="font-family:Verdana;"> in dry air to better detect OH (A-X) spectra. The rotational temperatures in humid air plasma column (50% of humidity) are larger than those of dry air plasma column by practically 30% near the nozzle of resonant cavity on the axis of the plasma column. This is partly due to attachment heating processes initiated by water vapor. A maximum of the measured absolute nitrogen density is also observed near the nozzle which is also larger for humid air plasma column. The obtained dissociation degrees of molecular nitrogen in both dry and humid air plasma along the air plasma column are lower than the cases where only thermodynamic equilibrium is assumed. This is characteristic of the absence of chemical and energetic equilibria not yet reached in the air plasma column dominated by recombination processes.
机译：第一次，处于其基态的原子氮绝对密度 style =“ font-family :;” “ =”“> style =” font-family：Verdana;“>（ style =” font-family：Verdana;“> N style =” font -family：Verdana;“> 4 style =” font-family：Verdana;“> S）已在排放后的干湿空气等离子体柱中进行了测量。空间分辨的绝对密度导致获得等离子体中分子氮的解离度，当将空气流以10 slm的压力直接注入微波谐振腔时，在600 mbar的上游气体调节室内产生热等离子体（2.45 style =“ font-family :;”“ =”“> style =” font-family :;“” =“”> style = “字体家族：Verdana;“> GHz，1 kW）位于下游侧。基于激光诱导荧光光谱和双光子激发（TALIF）的密度测量，尤其是沿等离子体的径向和轴向位置进行TALIF信号的校准已完成 styl e =“ font-family：Verdana;”>就地 style =“ font-family：Verdana;”>（ style =“ font-family ：Verdana;“>即 style =” font-family：Verdana;“>在同一气体调节室中但没有等离子体），使用含k的空气混合物。通过添加少量的H style =“ font-family：Verdana;”> 2 style =“ font-family：Verdana;”>在干燥的空气中可以更好地检测OH（AX）光谱。湿空气等离子体柱的旋转温度（湿度的50％）比干燥空气等离子体柱的旋转温度在等离子体柱的轴线上的谐振腔喷嘴附近高出大约30％。这部分是由于水蒸气引发的附件加热过程。在喷嘴附近也观察到最大的绝对氮密度，这对于湿空气等离子体柱也较大。与仅假定热力学平衡的情况相比，沿空气等离子体柱在干燥和潮湿空气等离子体中获得的分子氮的解离度均较低。这是在以重组过程为主导的空气等离子体柱中尚未达到化学和高能平衡的特征。

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