摘要
利用同步辐射真空紫外光和飞行时间质谱，研究了丙烯腈的真空紫外光电离解离过程。通过测量各离子的光电离效率曲线，获得了丙烯腈的电离势和各种碎片离子的出现势。分析了主要碎片离子的光电离解离通道，并结合有关热力学数据，算出它们的标准生成焓。并分析了它们的光电离解离通道及其随激发能量变化的竞争情况。
Photoioinzation and photodissociation of cyanoethylene are pefformed by using vacuum ultthviolCt (VUV) photons from Hefei synchrotron radiation sotirce and a time-of-flight mass spectrometer (TOF- MS). The photoionimtion mass spectrum and the photoionization effidency (PIE) curves of all the observed ions from cyanoethylene were measured. The appearance potentials of all ions wer obtained from their PIE curves. From these data, the fortnation enthalpies of sorne chief ions have been evaluated, and the possible channels and their competition of dissodative photoionization have been discussed. The experimetal results show that a small stable molecule HCN is easily lost, thus the ion is forned, and this channel is the chief dissociative photoionization channel.
基金
国家自然科学基金
关键词
丙烯腈
真空
紫外
光电离
出现势
生成焓
解离
Cyanoethylene
VUV
Photoionization
Appearance potential
Formation enthalpy
