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Now,the dissociation mechanisms of the CH3Cl+ ions are clear TEXT SIZE: A A A
Date:2016.11.15 Author:LIN Xiaoxiao Clicks:

 Building on the well-established capabilities of photoelectron spectroscopy (PES) and photoionization mass spectrometry (PIMS), the method of photoelectron photoion coincidence PEPICO simultaneously collects both electrons and ions in photoionization and can provide more additional information. It has been shown that PEPICO is powerful to prepare and analyze state-selected ions and has been widely utilized in the field of chemical dynamics.

In cooperation with the French National Synchrotron Radiation Laboratory (Synchrotron SOLEIL), the group of Prof. ZHANG Weijun at Anhui Institute of Optics and Fine Mechanics (AIOFM), Chinese Academy of Sciences (CAS), has made new progresses in the technical development of synchrotron-based PEPICO and revealed the detailed dissociation mechanisms of the CH3Cl+ ions.

Dr. TANG Xiaofeng, one staff of the group, has been focusing on the development of PEPICO and its applications in recent years. Dr. TANG and his co-workers successfully upgraded the double imaging electron/ion coincidence end-station and have greatly enhanced the performances of the setup, especially on the vacuum, the mass resolution, and the energy resolution etc. The work entitled “Vacuum upgrade and enhanced performances of the double imaging electron/ion coincidence end-station at the vacuum ultraviolet beamline DESIRS” has already been published in the AIP journal of Review of Scientific Instruments (86, 123108, 2015).

Just very recently, the group has investigated the dissociation dynamics of energy-selected CH3Cl+ ions utilizing the PEPICO setup and synchrotron radiation. It shows that the dissociation of CH3Cl+ ions undergoes specific reactions into different products depending on the ions internal state. The appearance energies of the energetically accessible fragment ions, CH2Cl+, CHCl+, CH3+ and CH2+, have been measured precisely from their respective mass-selected threshold photoelectron spectra (TPES) or photoionization efficiency (PIE) curves. In particular, the internal energy distributions of the CH3+ fragment ions have been assigned successfully via the high-resolution electron and ion kinetic energy correlation diagram. Then combined with accurate quantum chemical calculations, the detailed dissociation mechanisms of the CH3Cl+ ions have been clearly revealed. This work, entitled “Double imaging photoelectron photoion coincidence sheds new light on the dissociation of energy-selected CH3Cl+ ions” has been published in Physical Chemistry Chemical Physics (18, 23923, 2016).

The work was supported by the National Natural Science Foundation of China and the Natural Science Foundation of Anhui Province.


The article links: http://scitation.aip.org/content/aip/journal/rsi/86/12/10.1063/1.4937624




Fig. 1 The vacuum ultraviolet (VUV) photoionization time of flight mass spectrum of CH3Cl and (a) mass-selected electron image and (b) ion image corresponding to the CH3+ fragment ions; (c) Electron and ion kinetic energy correlation diagram and the assignment along the CH3+(1A1,v2) + Cl(2P1/2) dissociation channel. (Imaged by TANG Xiaofeng)




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