CO $_2$的纳秒分辨振转激发
Nanosecond resolved ro-vibrational excitation of CO$_2$
摘要：
我们首次报道了CO $_2$振转激发的ns分辨吸收测量。8纳秒的高时间分辨率是可能的快速检测器（上升时间5纳秒），在中红外区域敏感。分辨率是通过量子级联激光器的缓慢温度扫描和分段数据捕获方案来实现的。研究了10% CO $_2$ + 90% He气体在150 mbar、重复频率2 kHz下的重复脉冲ns放电。不同的振动模式，以及相关的振动和旋转的温度内的放电脉冲的长度只有150 ns的人口密度的演变同时确定，并提供有价值的洞察CO $_2$激发动力学。一个优先的非对称振动模式的激发观察后不久，在放电阶段的击穿。
英文摘要：
We report first ns-resolved absorption measurements of the ro-vibrational excitation of CO$_2$. The high temporal resolution of 8 ns is made possible by a fast detector (rise-time 5 ns), sensitive in the mid-infrared region. The resolution is achieved by a slow temperature scan of a quantum cascade laser and a segmented data capturing scheme. A repetitively pulsed ns discharge in 10% CO$_2$ + 90% He at 150 mbar and a repetition rate of 2 kHz is investigated. The evolution of the population densities of the different vibration modes as well as the associated vibrational and rotational temperatures within the discharge pulse of only 150 ns length are simultaneously determined and provide valuable insight into the CO$_2$ excitation dynamics. A preferential excitation in the asymmetric vibrational mode is observed in the discharge phase shortly after the breakdown.
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