By J. C. Lorquet, B. Leyh (auth.), M. A. Almoster Ferreira (eds.)
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Extra resources for Ionic Processes in the Gas Phase
The major application is in low-energy ionization where the mass spectral difference among isomeric compounds frequently are enhanced. As the ultimate, charge exchange can be used to ionize selectively those components of complex mixtures which have the lowest ionization energies. Acknowledgements The author is indebted to the Natural Sciences and Engineer- CHARGE EXCHANGE MASS SPECTROMETRY 39 ing Research Council of Canada for financial support and to his co-workers, listed in the references, for their contribution to this work.
Also the lifetime of this complex against unimolecular decomposition, ~d' must be sufficiently long to allow at least partial isotopic mixing to occur. Thus ~d is an important parameter in determining the efficiency of these reactions. Estimates of the magnitude of ~d for the intermediate complexes formed in several reactions have been obtained from SIFT studies of the corresponding ternary association reactions (Adams and Smith, 1982). There are, however, two types of reactions in which long-lived complexes do not necessarily need to form but in which nevertheless isotope exchange might be considered to have occurred.
It is interesting to note that for reaction (16), kobs at 300 K is significantly smaller than kc/2 indicating that ~d (or more specifically 'rd! N2) complex, as is also evident from the relative production rates of these complexes in ternary association reactions (Adams and Smith, 1982). This proton shuttling model has been extended successfully to describe more complex systems (see below). McMahon et al (1976) have used an ICR apparatus to study proton transfer in the reaction: 14NH4 + + 15NH ~ 15NH + + 14NH 3~ 4 3 and also find that kf = kr ~ k c /2.
Ionic Processes in the Gas Phase by J. C. Lorquet, B. Leyh (auth.), M. A. Almoster Ferreira (eds.)