Velocity Map Imaging Study of Charge-Transfer and Proton-Transfer Reactions of CH3 Radicals with H3+

2015 ◽  
Vol 6 (9) ◽  
pp. 1684-1689 ◽  
Author(s):  
Linsen Pei ◽  
Eduardo Carrascosa ◽  
Nan Yang ◽  
Stefano Falcinelli ◽  
James M. Farrar
Keyword(s):  
Charge Transfer ◽  
Proton Transfer ◽  
Imaging Study ◽  
Transfer Reactions ◽  
Velocity Map Imaging ◽  
Proton Transfer Reactions

Mass Spectrometric Observation of Electron and Proton Transfer Reactions between Positive Ions and Neutral Molecules

1962 ◽  
Vol 17 (6) ◽  
pp. 452-460 ◽  
Author(s):  
A. Henglein ◽  
G. A. Muccini
Keyword(s):  
Charge Transfer ◽  
Proton Transfer ◽  
Cross Sections ◽  
Low Voltage ◽  
Molecular Size ◽  
Ion Source ◽  
Mass Spectrometric ◽  
Transfer Reactions ◽  
Fragment Ions ◽  
Proton Transfer Reactions

The method of CERMAK and HERMAN has been applied to mass spectrometric studies of symmetrical electron and proton transfer processes. The characteristics of the ion source used have been investigated both experimentally and theoretically. A new type of ionization efficiency curve is obtained if the current o secondary ion is plotted as a function of the voltage between ionization chamber and electron trap at constant low voltage between the filament and the chamber. Essentially complete discrimination of primary ions has been achieved.Electron transfer occurs with rather low cross section in methane but increases with molecular size and with increasing unsaturation. Large cross sections were observed in sulfur and iodine containing compounds. Double charge transfer reactions such asNO++ + NO → NO + NO++, Xe++ + Xe → Xe + Xe++have also been observed. Proton transfer reactions have been observed in several simple molecules. Some experimental results are presented which indicate that proton transfer may occur via a complex (at low kinetic energies) or as a stripping process (at higher energies).Fragment ions have also been observed in the secondary mass spectra of several compounds. While part of these may result from the scattering of primary fragment ions, in some cases additional processes have to be postulated such as hydride ion transfer and dissociative charge transfer from vibrationally excited ions.

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