1,2-环氧辛烷的同步辐射光电离解离研究

Dissociative Photoionization of 1,2-Epoxyoctane Studied with Synchrotron Radiation

利用同步辐射产生的真空紫外光和反射式飞行时间质谱仪，在超声冷却条件下测量了1，2-环氧辛烷在光子能量9.8~16.6 eV能区的光电离解离过程，获得了不同能量光子作用下的电离解离产物。通过测量各离子的光电离效率曲线，得到了主要碎片离子的出现势。结合G3理论计算得到了母体离子、中性碎片及离子碎片的结构与能量，通过对比实验测量值与理论值给出了1，2-环氧辛烷的光电离解离通道.

Dissociative photoionization of 1,2-epoxyoctane was investigated by synchrotron radiation vacuum ultraviolet photons in the energy region of 9.8-16.6 eV under ultrasonic molec-ular beam. Dissociative fragment ions were measured with reffection time-of-ight mass spectrometer at di erent photon energies. Appearance potentials of the dominative ion fragments were determined through photoionization efficiency curves. The structures and energies of the parent, ionized and neutral radicals were obtained with G3 calculations. Through comparing the experimental results with the theoretical calculations, we proposed the dissociative channels for the photoionization of 1,2-epoxyoctane.