The excitation and dissociation of CO 2 admixed to argon and helium atmospheric pressure radio frequency plasmas is analyzed. The absorbed plasma power is determined by voltage and current probe measurements and the excitation and dissociation of CO 2 and CO by transmission mode Fourier-transform infrared spectroscopy (FTIR). It is shown, that the vibrational temperatures of CO 2 and CO are significantly higher in an argon compared to a helium plasma. The rotational temperatures remain in both cases close to room temperature. The conversion efficiency, expressed as a critical plasma power to reach almost complete depletion, is four times higher in the argon case. This is explained by the lower threshold for the generation of energetic particles (electrons or metastables) in argon as the main reactive collision partner, promoting excitation and dissociation of CO 2 , by the less efficient quenching of vibrational excited states of CO and CO<...

中文翻译：

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在稀有气体大气压等离子体中重稀释的CO 2的激发和离解

分析了混合在氩气和氦气大气压射频等离子体中的CO 2的激发和解离。吸收的等离子体功率由电压和电流探针测量以及传输模式傅里叶变换红外光谱（FTIR）决定CO 2和CO的激发和解离。结果表明，与氦等离子体相比，氩气中CO 2和CO的振动温度明显更高。在两种情况下，旋转温度都保持接近室温。在氩气情况下，转换效率以达到几乎完全耗尽的临界等离子体功率表示，是后者的四倍。这可以通过较低的阈值来解释，该阈值是在氩气中作为主要的反应性碰撞伴侣而生成高能粒子（电子或亚稳态）的原因，