关键词: 同步辐射, 光电离, 标准生成焓, 环氧氯丙烷

Abstract:

Photoionization and Photodissociation of epichlorohydrin are performed using a time-of-flight mass spectrometer(TOF-MS) with vacuum ultraviolet(VUV) photons from Hefei synchrotron radiation source. Photoionization mass spectrum and photoionization efficiency(PIE) curves of the fragment ions are measured. The appearance potentials of the fragment ions are obtained from their PIE curves. From these data, the formation enthalpies of some ions have been evaluated and their possible channels of dissociative photoionization have been discussed. The experimental results show that the mother ion of epichlorohydrin is unstable and the chlorine atom is easily lost to form ring C_3H_5O+ ion. Other fragment ions come from the dissociation of C_3H_5O+ ions.

Key words: Synchrotron radiation, Photoionization, Enthalpy, Epichlorlhydrin