Synchrotron Radiation Photoelectron Conformal Technology and Its Application Research Progress
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Vacuum ultraviolet photoionization time-of-flight mass spectrum of CH3Cl molecule. (a) Photoelectron images corresponding to CH3+ fragments with mass selection, (b) CH3+ fragment ion images, (c) Electron/ion translational energies in accordance with correlation diagrams.
Recently, Zhang Wei, a researcher at Anhui Institute of Optics and Fine Mechanics at the Chinese Academy of Sciences' Institute of Materials Science, collaborated with Synchrotron SOLEIL, a national laboratory for synchrotron radiation, to make new progress in synchrotron radiation photoelectron photoionization technology and its application research. The related research work was published in the journal Physical Chemistry Chemical Physics published by the Royal Society of Chemicals (RSC) under the title “Double imaging photoelectron photoion coincidence sheds new light on the dissociation of energy-selected CH 3 Cl+ ionsâ€.
Photoelectron photoion coincidence (PEPICO) simultaneously detects electron and ion signals generated by molecular photoionization, and conforms measurements of electrons and ions to provide more experimental information than photoionization mass spectrometry and photoelectron spectroscopy. The study of effective methods for the selection of ions with quantum states has important applications in the field of chemical kinetics and other research.
Tang Xiaofeng, an associate research fellow in the research group, has been working on the development and application of synchrotron radiation photoelectron photoionization technology in recent years. At the end of 2015, it cooperated with Synchrotron SOLEIL, the national national Synchrotron Radiation Laboratory in France, to upgrade and improve the optoelectronic photoion conformance imaging spectrometer. This significantly improved the performance indicators such as vacuum, mass spectrometry, and energy resolution of the imaging spectrometer. The results were achieved with Vacuum upgrade and Enhanced performances of the double imaging electron/ion coincidence end-station at the vacuum ultraviolet beamline DESIRS is published in the Review of Scientific Instruments published by the American Institute of Physics (AIP) (Rev. Sci. Instrum., 86, 123108, 2015).
Recently, the two parties have further cooperated to use photoelectron photoionization technology to prepare chloromethane ions with quantum state selection, and carried out the study of the dissociation kinetics of methyl chloride ions. Through synchrotron radiation experiments, a threshold photoelectron spectrum with mass selection and high-resolution electron/ion translational energy coincidence images were obtained. The appearance potential of dissociated fragments of methyl chloride ions was accurately measured, and the internal energy distribution of the dissociation fragments was performed. Calibration. The results show that the dissociation of methyl chloride ions has obvious quantum state selection effect. Combining high-precision quantum chemistry theoretical calculations, the dissociation kinetic information of each electronic state of methyl chloride ion is fully and clearly revealed.
The above research work was supported by the National Natural Science Foundation of China and the Natural Science Foundation of Anhui Province.
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