OH自由基启动甲苯光氧化产物的质谱

在烟雾腔系统内，辐照甲苯/CH₃ONO/NO/空气混合系统，启动甲苯的光氧化反应. 利用同步辐射光电离质谱在线检测甲苯光氧化气相产物，并用气溶胶飞行时间质谱实时测量甲苯光氧化形成的二次有机气溶胶粒子. 实验结果表明，呋喃、甲基乙二醛，2-甲基呋喃、苯甲醛、甲基酚和苯甲酸是甲苯光氧化反应形成的气体相和粒子相的主要产物，而乙二醛、2-羟基-3-氧代-丁醛、硝基甲苯和甲基硝基酚只存在粒子相.

Mass Spectrometry Study of OH-initiated Photooxidation of Toluene

The composition of products formed from photooxidation of the aromatic hydrocarbon toluene was investigated. The OH-initiated photooxidation experiments were conducted by irradiating toluene/CH₃ONO/NO/air mixtures in a smog chamber, the gaseous products were detected under the supersonic beam conditions by utilizing vacuum ultraviolet pho-toionization mass spectrometer using synchrotron radiation in real-time. And an aerosol time-of-flight mass spectrometer was used to provide on-line measurements of the individ-ual secondary organic aerosol particle resulting from irradiating toluene. The experimen-tal results demonstrated that there were some differences between the gaseous products and that of particle-phase, the products of glyoxal, 2-hydroxyl-3-oxo-butanal, nitrotoluene, and methyl-nitrophenol only existed in the particle-phase. However, furane, methylglyoxal, 2-methylfurane, benzaldehyde, cresol, and benzoic acid were the predominant photooxidation products in both the gas phase and particle phase.