超音速流动条件下Sn/N2O(O2)化学发光反应动力学的实验研究

在温度低于900 K和1—10乇腔压范围内, 首次采用等离子加热方法产生金属Sn蒸气, 并利用超音速流动反应装置, 研究了载气为N_2和N_2+Ar时Sn+N_2O和Sn+O_2的化学发光反应。首次采用光学多通道分析仪(OMA Model 1450)获得了不同腔压下SnO(a~3∑~+—X~1∑~+)跃迁的化学发光光谱, 得出了不同腔压下SnO(a~3∑~+)态的相对振动布居, 并将本实验结果与低亚音速高温快速流动反应器(HTFFR)中所得的结果做了比较。

EXPERIMENTAL STUDY OF THE DYNAMICS OF THE Sn/N2O(O2) REACTION IN A SUPERSONIC FREE JET

An experimental study of the chemiluminescent reaction of Sn with N_2O and O_2 is first performed in a supersonic flow apparatus by using the electric-arc plasma technique to generate atomic Sn vapor. The temperature and pressure in the reacton zone are 900 K and 1-10 torr, respectively. The emission spectra of SnO (a~3Σ~+-X~1Σ~+) are recorded using an optical multichannel analyzer (OMA) at different reaction pressures and the dependence of the relative vibrational population of the product SnO(a~3Σ~+), on the pressure has been presented. The vibraitional relaxation rates of the SnO (a~3Σ~+) by Ar and Ar+N_2 had been calculated as ～10~4 torr~(-1) s~(-1) by the leastsquare fit of the experimental data. The emissions from the electronically excited states, b~3Π and a~3Σ~+, in the reaction of Sn+O_2 can be explained in terms of the reactions of Sn_2+O_2 and Sn_2+O. An unusually high population of a~3Σ~+v′=1 in the reaction of Sn+O_2 is also found. The results are compared with those obtained in high-temperature-fast-flow reactor (HTFFR) and the reaction mechanism is discussed.