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中文摘要：
本文利用同步辐射真空紫外光电离质谱技术对当量为0．75、1．00和1．79的低压预混乙基苯火焰进行了研究（P=4．0kPa），得到了详细的中间体构成信息，并通过质谱分析，对不同当量下中间体浓度的变化进行了讨论。实验发现，乙基苯贫燃火焰中产生了大量的含氧中间体，而富燃火焰中产生了更多的碳氢化合物中间体，尤其是多环芳烃。苯、甲苯和苯乙烯在不同当量的火焰中均具有较强的信号，从而验证了文献中的乙基苯的三条主要解离通道。
英文摘要：
Premixed ethylbenzene flames （φ = 0.75, 1.00, and 1.79） at 4.0 kPa were studied using synchrotron vacuum ultraviolet photoionization mass spectrometry （SVUV-PIMS）. Combustion intermediates including isomers and radicals were identified by the measurement of photoionization efficiency spectra; the variation of concentrations of combustion intermediates in different equivalence ratios was also discussed based on the mass spectrometric analysis. The fuel-lean flame produced more oxygenated intermediates while the fuel-rich flame generated more hydrocarbon intermediates. High signals of benzene, toluene, and styrene in all flames validate the major decomposition channels of ethylbenzene in literature.
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