The time-dependent evolution of the energy transfer into gas heating in the afterglow of pulsed CO2 and CO2–N2 glow discharges produced in cylindrical tubes at low pressures (1–5 Torr) is theoretically investigated, by developing a self-consistent model that couples the time-dependent gas thermal balance equation with the vibrational kinetics. The modelling predictions are in good agreement with recently published experimental data on gas temperature, obtained via time-resolved in situ Fourier transform infrared spectroscopy. The cooling of the gas in the afterglow is found to be strongly dependent on the thermal conductivity and the wall temperature. It is verified that wall and volume deactivation of CO2 vibrationally excited species influences the gas heating along the afterglow, in different proportions depending on the pressure of the gas. The time-resolved contributions of each of these cooling and heating mechanisms are discussed in detail. The new results bring an additional validation of a set of mechanisms and rate coefficients for vibrationally-energy transfers previously proposed.

中文翻译：

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低压下脉冲 CO2 和 CO2–N2 辉光放电余辉中的气体加热动力学

通过开发一个自洽的耦合模型，在理论上研究了在低压（1-5 托）圆柱形管中产生的脉冲 CO2 和 CO2-N2 辉光放电的余辉中能量转移到气体加热的时间依赖性演变。具有振动动力学的瞬态气体热平衡方程。建模预测与最近发表的关于气体温度的实验数据非常吻合，这些数据是通过时间分辨原位傅里叶变换红外光谱获得的。发现余辉中气体的冷却强烈依赖于热导率和壁温。经证实，CO2 振动激发物种的壁和体积失活会影响沿余辉的气体加热，其影响取决于气体压力的不同比例。详细讨论了这些冷却和加热机制中每一个的时间分辨贡献。新结果进一步验证了先前提出的振动能量转移的一组机制和速率系数。