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...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 C3H5O+ ion. Other fragment ions come from the dissociation of C3H5O+ ions.展开更多
Anodic passive filins formed on Fe60Ni40 in H3BO3-Na2B4O7 buffer solution (pH=9.20) and in H3PO4-Na2HPO4 buffer solution (pH=7.41) have been investigated by XPS. By analysis of the chemical states of elements, compone...Anodic passive filins formed on Fe60Ni40 in H3BO3-Na2B4O7 buffer solution (pH=9.20) and in H3PO4-Na2HPO4 buffer solution (pH=7.41) have been investigated by XPS. By analysis of the chemical states of elements, components and structure of films,we have probed into the mechanism of the formation of the anodic passive films. In the H3BO3-Na2B4O7 buffer solution (pH=9.20), the formation of passive film was controlled by adsorption of OH-, and the growth of the passive film was a function of passivation potential and time in passive range. The duplex structure, the Fe 、Ni/FeOx、NiO/FeOOH、 Ni(OH)2 was confirmed by detailed peak analysis and profiling. In H3PO4-Na2HPO4 buffer solution (pH= 7.41), the formation of passive film was controlled by competitive react, that is, cations of anodic dissolution reacted with anions such as PO and OH- et al in solution to form compacted deposit films of the phosphate phase.展开更多
文摘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 C3H5O+ ion. Other fragment ions come from the dissociation of C3H5O+ ions.
文摘Anodic passive filins formed on Fe60Ni40 in H3BO3-Na2B4O7 buffer solution (pH=9.20) and in H3PO4-Na2HPO4 buffer solution (pH=7.41) have been investigated by XPS. By analysis of the chemical states of elements, components and structure of films,we have probed into the mechanism of the formation of the anodic passive films. In the H3BO3-Na2B4O7 buffer solution (pH=9.20), the formation of passive film was controlled by adsorption of OH-, and the growth of the passive film was a function of passivation potential and time in passive range. The duplex structure, the Fe 、Ni/FeOx、NiO/FeOOH、 Ni(OH)2 was confirmed by detailed peak analysis and profiling. In H3PO4-Na2HPO4 buffer solution (pH= 7.41), the formation of passive film was controlled by competitive react, that is, cations of anodic dissolution reacted with anions such as PO and OH- et al in solution to form compacted deposit films of the phosphate phase.
