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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Energy transfer in the d(3)II(g)-a(3)II(u) (0-0) swan bands of C-2: Implications for quantitative measurement
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Energy transfer in the d(3)II(g)-a(3)II(u) (0-0) swan bands of C-2: Implications for quantitative measurement

机译：C-2的d（3）II（g）-a（3）II（u）（0-0）天鹅带中的能量转移：定量测量的意义

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摘要

Energy transfer effects on dicarbon (C-2) d(3)Pi(g) <- a(3)Pi(u) laser-induced fluorescence (LIF) spectra in fuel-rich acetylene atmospheric-pressure flames have been studied using a combination of two different two-dimensional techniques. Measurements using a picosecond laser system in conjunction with a streak camera allowed determination of typical fluorescence lifetimes of levels in the d state and of population changes introduced by rotational energy transfer (RET) and by state-dependent quenching. Excitation-emission spectroscopy yielded two-dimensional maps containing all excitation and all emission spectra in the spectral ranges between 19 340 and 20 150 cm(-1) (excitation) and from 546 to 573 nm (emission) and allowed unambiguous assignment of all transitions in this spectral region. Our measurements show a comparatively long quenching lifetime (around 2 ns) and dominant effects of energy transfer on shape and intensity of the acquired spectra (90% of the fluorescence stems from levels populated by ET). A pronounced dependence of the total RET on the quantum number of the initially excited state is observed. Vibrational energy transfer (VET) is significantly weaker (only 5% contribution for excitation in the v' = 1 level). Implications for quantitative concentration measurements are discussed, and exemplary spatially resolved profiles in a well-characterized low-pressure propene flame are presented.
机译：研究了能量转移对富含燃料的乙炔大气压火焰中的二碳（C-2）d（3）Pi（g）<-a（3）Pi（u）激光诱导的荧光（LIF）光谱的影响。两种不同的二维技术的结合。使用皮秒激光系统结合条纹相机进行的测量可以确定d状态下的典型荧光寿命，以及通过旋转能量转移（RET）和状态相关的猝灭引入的种群变化。激发-发射光谱产生了二维图，其中包含19340至20150 cm（-1）（激发）和546-573 nm（发射）之间的光谱范围内的所有激发和所有发射光谱，并允许所有跃迁的明确分配在这个光谱区域。我们的测量结果表明，淬灭寿命较长（约2 ns），并且能量转移对所获取光谱的形状和强度有显着影响（90％的荧光源于ET所产生的水平）。观察到总RET对初始激发态的量子数有明显的依赖性。振动能量传递（VET）明显较弱（在v'= 1的水平下，只有5％的激励作用）。讨论了定量浓度测量的意义，并提出了在充分表征的低压丙烯火焰中的示例性空间分辨轮廓。

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