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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Laser diagnostics on atmospheric pressure discharge plasmas, including cryoplasmas, in environments around room and cryogenic temperature
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Laser diagnostics on atmospheric pressure discharge plasmas, including cryoplasmas, in environments around room and cryogenic temperature

机译：激光诊断大气压放电等离子体，包括冷冻腺，在房间内的环境中和低温温度

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Cryoplasmas, the plasma gas temperature (T-g) of which can be controlled continuously below room temperature, show various unique and advantageous properties depending on T-g. Recently, the T-g dependence of plasma chemistry related to metastable helium (He-m) has been revealed in helium cryoplasmas. However, T-g was only estimated by thermal calculation from the temperature outside the plasmas. In this study, for better evaluation of T-g, near-infrared laser heterodyne interferometry (NIR-LHI) measurements were conducted in atmospheric pressure helium pulsed discharge plasmas at around room and cryogenic ambient temperatures (T-a). The maximum difference between T-g and T-a was evaluated as 47 K at T-a = 300 K with 282 mW power consumption. To further investigate the T-g dependence of plasma chemical reactions related to He-m, laser absorption spectroscopy (LAS) was performed on the same discharge plasmas to measure the He-m density and lifetime. The He-m lifetime was longer at lower T-g, i.e. the lifetime at T-g = 145 K (9.6 mu s) was seven times longer than that at T-g = 386 K (1.4 mu s). By comparing the results with the numerically simulated rates of He-m quenching reactions taking T-g into account, the mechanism of the He-m quenching reaction was revealed to vary with T-g even though the main quenching reaction was a three-body collision at all T-g. In this manner, the combination of NIR-LHI with LAS led directly to the T-g dependence of He-m quenching reactions.
机译：冷冻血症，其等离子体气体温度（T-G）可以在室温下方连续控制，取决于T-g的各种独特且有利的性质。最近，在氦脱果壳中揭示了血浆化学与稳定氦（He-M）相关的T-G依赖性。然而，仅通过从等离子体之外的温度估计T-g估计。在本研究中，为了更好地评估T-G，在室内和低温环境温度（T-A）的大气压氦脉冲排出等离子体中进行近红外激光杂差干扰法（NIR-LHI）测量。 T-G和T-A之间的最大差异在T-A = 300K时评价为47k，具有282 MW功耗。为了进一步研究与HE-M相关的血浆化学反应的T-G依赖性，在相同的放电等离子体上进行激光吸收光谱（LAS）以测量HE-M密度和寿命。 He-M寿命在较低的T-G中更长，即T-G = 145k（9.6μs）的寿命比T-G = 386k（1.4μs）的寿命长7倍。通过将结果与以TG考虑到的HE-M猝灭反应的数值模拟速率进行比较，揭示了HE-M猝灭反应的机理以改变TG，即使主淬火反应在所有TG都是三体碰撞。以这种方式，NIR-LHI与LAS的组合直接达到HE-M淬火反应的T-G依赖性。

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