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Reliability of estimation of recombination energies of molecular radical cations by charge exchange and a test of the exoergicity rule
Author(s) -
Youn Yeu Young,
Choe Joong Chul,
Kim Myung Soo
Publication year - 2003
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.904
Subject(s) - chemistry , atomic physics , ionization , ion , excited state , charge exchange , electron ionization , mass spectrometry , charge (physics) , collision , work (physics) , ionization energy , electron , polyatomic ion , nuclear physics , physics , thermodynamics , quantum mechanics , computer security , organic chemistry , chromatography , computer science
Charge exchange occurring in a collision cell of a mass spectrometer was used previously to find the very long‐lived excited electronic states of molecular cations generated by electron ionization. The underlying criterion in the method, called the exoergicity rule, was that only electronically exoergic and resonant processes have large cross sections at low collision energy. The validity of this rule has been checked in this work by estimating the recombination energies of some molecular ions based on the presence/absence of charge‐exchange signals from gases with different ionization energies, and comparing these estimates with the literature values. It is concluded that a recombination energy can be estimated to within an upper limit uncertainty of 0.1 eV with this technique, which validates the exoergicity rule proposed previously. Copyright © 2003 John Wiley & Sons, Ltd.