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利用介质阻挡射频放电产生了单重态氧,实验中在放电气体中加入了一定量的NO气体以提高单重态氧的相对产率。通过研究放电出口处单重态氧发光强度与NO流量的变化关系,考查了NO分子对放电产生单重态氧的影响。实验结果表明,NO分子对单重态氧相对产率的提高作用呈现出先迅速增强,继而缓慢达到饱和并略有下降。在所设计的实验条件下,最佳NO流量应为O2流量的3%左右。给出了NO分子对放电产生单重态氧浓度的拟合公式,拟合结果与实验值吻合很好。从化学反应机理上对该公式给出了解释,提出了NO分子猝灭氧原子过程的一种新的可能机理,估算出该过程的速率常数为1.8×10-30 cm6/s。
The use of dielectric barrier radio frequency discharge generated singlet oxygen in the experiment in the discharge gas by adding a certain amount of NO gas to increase the relative yield of singlet oxygen. By studying the relationship between the emission intensity of singlet oxygen and the NO flow at the discharge outlet, the effect of NO on the singlet oxygen produced by discharge was investigated. The experimental results show that the increasing effect of NO on the relative yield of singlet oxygen shows a rapid increase at first and then slowly reaches saturation with a slight decrease. In the experimental design conditions, the best NO flow should be about 3% of the O2 flow. The fitting formula of NO molecule on singlet oxygen concentration in discharge is given, and the fitting result is in good agreement with the experimental data. This formula is given from the chemical reaction mechanism. A new possible mechanism of quenching oxygen atoms by NO molecules is proposed. The rate constant of this process is estimated to be 1.8 × 10-30 cm6 / s.