Temperature- and species-dependent quenching of CO B probed by two-photon laser-induced fluorescence using a picosecond laser
Temperature- and species-dependent quenching of CO B probed by two-photon laser-induced fluorescence using a picosecond laser
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DOI：
10.1063/1.2206783
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发表时间：
2002-08
影响因子：
4.4
通讯作者：
T. Settersten;B. Patterson;J. Gray
中科院分区：
文献类型：
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作者：
T. Settersten;B. Patterson;J. Gray
本文报道了改进的NO原子A ~+~ 2（v′=0）态荧光猝灭截面随温度变化的测量方法，测量了NO（X ~+~ 2）、H_2O、CO_2、O_2、CO、N_2和C_2H_2在294 ~ 1300 K温度范围内的猝灭截面。用454 nm皮秒激光双光子激发，布居到A_（10）+2（v′=0）态，并直接测量了A_（10）+2（v′=0）态荧光的衰减速率。热平均猝灭截面从荧光衰减速率对猝灭剂气体压力的依赖性确定。我们的测量结果进行了比较，以前的测量和模型的淬火截面，并提出了新的经验拟合的数据。我们的新的横截面数据，使预测与先前测量的荧光寿命在大气压下的甲烷-空气扩散火焰中非常一致。该协议解决了寿命测量和预测之间的差异...
We report improved measurements of the temperature-dependent cross sections for the quenching of fluorescence from the AΣ+2(v′=0) state of NO. Cross sections were measured for gas temperatures ranging from 294to1300K for quenching by NO(XΠ2), H2O, CO2, O2, CO, N2, and C2H2. The AΣ+2(v′=0) state was populated via two-photon excitation with a picosecond laser at 454nm, and the decay rate of the fluorescence originating from AΣ+2(v′=0) was measured directly. Thermally averaged quenching cross sections were determined from the dependence of the fluorescence decay rate on the quencher gas pressure. Our measurements are compared to previous measurements and models of the quenching cross sections, and new empirical fits to the data are presented. Our new cross-section data enable predictions in excellent agreement with prior measurements of the fluorescence lifetime in an atmospheric-pressure methane-air diffusion flame. The agreement resolves discrepancies between the lifetime measurements and predictions based...