利用同步辐射光电离质谱装置,测量了Ar.CO范德瓦尔斯(van der Waals,vdW)团簇的的光电离质谱和光电离效率曲线.将它们与CO分子的绝对光吸收光谱比较,发现在13.9到14.6eV能量范围内的Ar.CO+的光电离效率曲线主要反映了收敛到CO+(X2Σ+,v′=1,2和3)Rydberg系列和收敛到CO+(A2Π)的n=3的振动序列(v′=6—9)的特点;在14.6—15.75eV光子能量范围内的Ar.CO的光电离效率曲线主要反映了CO的光吸收特性.然而,由于Ar和CO之间的相互作用,其中的5个重要的光谱结构发生了蓝移;而在15.75—15.80eV光子能量范围内的Ar-CO的光电离效率曲线,它的属性受到组分Ar和CO的共同影响.与此同时,也从理论上计算了Ar.CO团簇的电离能、Ar.CO团簇和Ar.CO+团簇离子的离解能.
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 photoionization 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 individual secondary organic aerosol particle resulting from irradiating toluene. The experimental 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.
