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四极滤质器在交叉分子束研究中的应用,为质谱技术开辟了一个新的应用领域。本文报道了在交叉分子束装置上研究Ba+N_2O化学发光反应时,四极滤质器完成的二项工作:(1)测试不同条件下超音速分子束中混合气体的成分和N_2O分子的相对数密度;(2)用时间渡越法(TOF)测试超音速分子束中N_2O分子飞行的平均速度,并且从理论上讨论了双元混合气体中N_2O/He载气比和喷嘴温度对N_2O分子速度的影响。实验和计算结果表明,载气配比对改变反应物N_2O的平动能作用很大,而喷嘴温度主要影响N_2O分子的振动能,对于平动能的影响相对小些。实验结果还表明,在反应区,分子束中N_20/He比例与喷管内混合气体的N_2O/He比例不同,前者大于后者。
The application of quadrupole mass filter in cross molecular beam research opens up a new field of application for mass spectrometry. In this paper, we report two work done by the quadrupole mass filter in the study of Ba + N 2 O chemiluminescence reaction at a cross-molecular beam device: (1) The composition of mixed gas in supersonic molecular beam under different conditions and the relative content of N 2 O (2) Time-of-flight method (TOF) was used to test the average velocity of N 2 O molecules flying in the supersonic molecular beam and theoretically discussed the effect of N 2 O / He carrier gas ratio and nozzle temperature on the N 2 O molecules The impact of speed. The experiment and calculation results show that the carrier gas ratio has a great effect on the translational energy of the reactant N 2 O, while the nozzle temperature mainly affects the vibrational energy of N 2 O molecules, which has a relatively small influence on translational energy. The experimental results also show that in the reaction zone, the ratio of N_2O / He in the molecular beam and the N_2O / He ratio of the mixed gas in the nozzle are different, the former is larger than the latter.