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首页> 外文期刊>Plasma physics and controlled fusion >Mass spectrometry of neutrals and positive ions in He/CO2 non-equilibrium atmospheric plasma jet
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Mass spectrometry of neutrals and positive ions in He/CO2 non-equilibrium atmospheric plasma jet

机译：HE / CO2非平衡大气等离子体射流中中性和正离子的质谱和正离子

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Neutral species and positive ions are measured by means of mass spectrometry in the effluent of the non-equilibrium atmospheric plasma jet operated in He/0%-1%CO2 gas mixture. The capacitively coupled plasma source is the predecessor of the known COST reference jet with identical performance and it is operated in a diffuse mode with gas temperature close to the room temperature. Threshold ionisation molecular beam mass spectrometry is used to measure absolute densities of CO, O-2, O and O-3 species. The CO molecules are generated with densities up to 2 x 10(15) cm(-3) at 1 W absorbed power. The O-2 density is similar to 6 times lower than the CO density and even lower than the O density at level of 4.5 x 10(14) cm(-3). The O-3 density is negligibly small at 4 x 10(12) cm(-3). The measured O-2, O-3 and O absolute densities add up to similar to 57% of the expected oxygen amount. The high O density could indicate that the vibrational excitation of CO2 is ineffective in this plasma and gas mixture, because O would otherwise react quickly with vibrationally excited CO2(v) to form CO and O-2, the low energy efficiency is in agreement with the possibly low vibrational excitation. The highest energy efficiency is just 5% with 1% conversion efficiency. Ion mass spectrometry have been used to measure positive and negative ions, where only positive ions have been detected. The ion with highest signal is the
机译：通过质谱法通过质谱法测量中性物质和正离子在HE / 0％-1％CO 2气体混合物中运行的非平衡大气等离子体射流的流出物中测量。电容耦合等离子体源是已知成本参考射流的前述者具有相同的性能，并且其在漫射模式中操作，该漫射方式接近室温。阈值电离分子束质谱法用于测量CO，O-2，O和O-3种的绝对密度。在1W吸收的功率下，通过高达2×10（15）厘米（-3）的密度产生CO分子。 O-2密度与CO密度低6倍，甚至低于4.5×10（14）厘米（-3）的水平的o密度。 O-3密度在4×10（12）厘米（-3）下可忽略小。测量的O-2，O-3和O绝对密度加入到预期氧气量的57％。高o密度可以表明，CO2的振动激发在该等离子体和气体混合物中是无效的，因为O否则会用振动激发的CO2（v）反应形成CO和O-2，但低能量效率与之一致可能是低振动激发。最高能量效率仅为5％，转换效率为1％。离子质谱已经用于测量阳性和负离子，其中已经检测到正离子。最高信号的离子是

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