Temperature dependence of collisional broadening and shift for the Kr 4p(6)S(0)(1) -> 5p[3/2](2) electronic transition

Sahoo Abinash; Zelenak Dominic; Narayanaswamy Venkateswaran

摘要

Temperature scaling of collisional broadening parameters for krypton (absorber) 4 p(6)S(0)(1) -> 5p[3/2](2) electronic transition centered at 107.3 nm in the presence of major combustion species (perturber) is investigated. The absorption spectrum in the vicinity of the transition is obtained from the fluorescence due to the two-photon excitation scan of krypton. Krypton was added in small amounts to major combustion species such as CH4, CO2, N-2, and air, which then heated to elevated temperatures when flowed through a set of heated coils. In a separate experimental campaign, laminar premixed flat flame product mixtures of methane combustion were employed to extend the investigations to higher temperature ranges relevant to combustion. Collisional full width half maximum (FWHM)(omega(C)) and shift (delta(C)) were computed fromthe absorption spectrumby synthetically fittingVoigt profiles to the excitation scans, and their corresponding temperature scaling was determined by fitting power-law temperature dependencies to the w(C) and delta(C) data for each perturber species. The temperature exponents of w(C) and delta(C) for all considered combustion species (perturbers) were -0.73 and -0.6, respectively. Whereas the temperature exponents of w(C) are closer to the value (-0.7) predicted by the dispersive interaction collision theory, the corresponding exponents of delta(C) are in between the dispersive interaction theory and the kinetic theory of hard-sphere collisions. Comparison with existing literature on broadening parameters of NO, OH, and CO laser-induced fluorescence spectra reveal interesting contributions from non-dispersive interactions on the temperature exponent. (c) 2020 Optical Society of America

机译：氪气膨胀参数的温度缩放（吸收剂）4p（6）S（0）（1） - > 5p [3/2]（2）在主要燃烧物种（Perturber）存在下以107.3nm为中心的电子转换被调查了。由于Krypton的双光子激发扫描，从荧光获得转变附近的吸收光谱。在少量加入氪至诸如CH4，CO2，N-2等主要燃烧物质中，然后在流过一组加热的线圈时加热到升高的温度。在单独的实验活动中，使用甲烷燃烧的层状预混扁平火焰产品混合物，以将研究延伸至与燃烧相关的更高温度范围。碰撞全宽半最大（FWHM）（OMEGA（C））和换档（Δ（C））从合成融合型曲线的吸收光谱到激发扫描计算，并且通过拟合电力法温度依赖性来确定它们的相应温度缩放每个珀菌尔物种的W（c）和Delta（c）数据。所有考虑的燃烧物种（Perturbers）的W（c）和δ（c）的温度指数分别为-0.73和-0.6。而W（c）的温度指数更接近分散相互作用碰撞理论预测的值（-0.7），而Delta（c）的相应指数在分散相互作用和硬球碰撞的动态理论之间。与现有文献的展现参数较大，哦和CO激光诱导的荧光光谱的比较显示了对温度指数的非分散相互作用的有趣贡献。（c）2020美国光学学会

Temperature dependence of collisional broadening and shift for the Kr 4p(6)S(0)(1) -> 5p[3/2](2) electronic transition

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