本文利用同步辐射真空紫外光电离质谱技术对当量为0.75,1.00,1.25,1.50和1.75的低压预混甲苯火焰进行了研究(P=4.0 kPa).通过扫描光电离效率谱,得到了包括同分异构体和自由基在内的详细中间体构成.实验结果表明贫燃和当量火焰中产生了大量含氧中间体,而随着当量的提高,碳氢化合物中间体,尤其是芳香烃类中间体的种类和信号强度均不断增加,显示了氧化和热解机理在火焰中的角色变化.
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