We report first measurements of time-resolved absolute CO number densities and rotational temperatures in a non-thermal CO 2 plasma environment using TALIF with a nanosecond pulsed laser. Two-photon excitation spectra from the B 1Σ+(v′ = 0) ← X 1 Σ+ (v″ = 0) Q-branch are recorded and fitted to extract rotational temperatures. Absolute number densities are determined from the frequency-integrated excitation spectrum. The plasma under investigation is a pulsed glow discharge operated at a frequency of 60 Hz with an plasma-on time of 5 ms per plasma cycle, 50 mA plasma current and a pressure of 6.67 mbar. CO number densities range from (2.6 ± 0.6) × 10 22 m -3 to (1.2 ± 0.3) × 10 22 m -3, while rotational temperatures range from 370 ± 40 K to 700 ± 70 K at the beginning and end of the plasma-on phase, respectively. Our results show fair agreement with literature data.

中文翻译：

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在非热等离子体环境中使用 TALIF 测量的绝对 CO 数密度

我们报告了在非热 CO 2 等离子体环境中使用 TALIF 和纳秒脉冲激光器对时间分辨绝对 CO 数密度和旋转温度的首次测量。来自 B 1Σ+(v′ = 0) ← X 1 Σ+ (v″ = 0) Q 分支的双光子激发光谱被记录并拟合以提取旋转温度。绝对数密度由频率积分激发谱确定。所研究的等离子体是脉冲辉光放电，频率为 60 Hz，每个等离子体循环的等离子体开启时间为 5 ms，等离子体电流为 50 mA，压力为 6.67 mbar。CO数密度范围从（2.6±0.6）×10 22 m -3 到（1.2±0.3）×10 22 m -3 ，而旋转温度范围从370±40 K到700±70 K在开始和结束时等离子相，分别。