Ultraviolet absorption and laser-induced fluorescence of shock-heated acetylene

Ultraviolet absorption and laser-induced fluorescence of shock-heated acetylene
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冲击加热乙炔的紫外吸收和激光诱导荧光

DOI:
10.1016/j.proci.2016.05.018
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
C. Schulz
C. Schulz
中科院分区:
--
文献类型:
--
作者:
S. Zabeti;M. Fikri;C. Schulz

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作为燃料热解和燃烧的主要中间体,乙炔作为紫外线吸收和荧光的贡献者,迄今为止大多被忽视。在565 ~ 1500 K的反射激波后,研究了乙炔(C2H2)的温度依赖的紫外吸收截面。来自氘灯的光通过冲击加热的混合气体传输,并以~ 50µs的时间分辨率记录传输光谱。吸收光谱对温度有很强的依赖性,且随温度的升高有很强的红移。在900 K以上,在266 nm处观察到明显的吸收。采用266 nm激光激发,在激波管内记录了激光诱导荧光光谱。与吸收实验一致,在900 K以下没有观察到LIF信号。以上,在所研究的温度范围内,荧光强度增加,荧光光谱变宽。根据荧光强度和吸收截面,确定了相对有效荧光量子产率作为温度的函数。
Acetylene as a major intermediate in fuel pyrolysis and combustion has so far mostly been ignored as a contributor to UV absorption and fluorescence. Temperature-dependent ultraviolet absorption cross-sections of acetylene (C2H2) have been studied behind reflected shock waves between 565 and 1500 K. Light from a deuterium lamp was transmitted through shock-heated gas mixtures and transmission spectra were recorded with ∼50 µs time resolution. The absorption spectra strongly depend on temperature and show a strong red-shift with temperature. Above 900 K, significant absorption is observed at 266 nm. Laser-induced fluorescence (LIF) spectra were recorded in the shock tube using 266-nm laser excitation. In accord with absorption experiments, no LIF signal is observed below 900 K. Above, the fluorescence intensity increases and the fluorescence spectra become broader over the studied temperature range. From fluorescence intensity and absorption cross-sections, relative effective fluorescence quantum yields are determined as a function of temperature.
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