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利用同步辐射光电离质谱的方法研究了甲基丁烯醇(C5H10O)在9.0～15.5eV的真空紫外光电离和光解离过程.通过测量光电离效率曲线,得到了C5H10O的电离能和主要碎片离子的出现势.通过对实验和计算结果的比较,分析了母体离子可能的光电离解离机理.母体离子的解离通道可以分为2类:由C5H10O+直接发生键断裂的解离和经由过渡态的解离.确定了C4H 5+和C3H 5+离子的过渡态和中间体,其反应势垒与实验解离能是符合的.
The process of ionization and photodissociation of methyl butenol (C5H10O) at vacuum pressure from 9.0 to 15.5eV was studied by synchrotron radiation photoionization mass spectrometry. The ionization potential of C5H10O and the main fragment ions .The possible mechanism of photoionization dissociation of parent ion is analyzed by comparing the experimental results with those of the calculation results.The dissociation channels of parent ion can be divided into two types: the dissociation of bond breakage directly by C5H10O + The transition states and intermediates of C4H5 + and C3H5 + ions were determined, and the reaction barriers and experimental dissociation energies were consistent.