Formulation of Chemical Ionization Kinetics

The r-butyl reactant ions are formed in the near vicinity of the electron beam, and they drift to the ion exit slit of the ionization chamber under the influence of the repeller field. Protonated ester molecules (taken as a typical example) are formed along the path of the r-butyl ions by proton-transfer reactions, and after formation the protonated ester ions drift toward the ion exit slit under the influence of the repeller field. In the process of doing this they undergo decomposition reactions which may be looked upon as a set of parallel, competing first-order reactions, that is. 

Equation (34) is the equation for consecutive reactions, and its solution is (ROAcH+) = fcy (ROAc)(t-C4H9+)o/(fc/(ROAc) - X.fe,)] x 

The initial concentration of ROACH S, that is, the ROAcH formed by (31), is 

The mass spectrometer ion currents are proportional to ion concentrations when f = T, the time required for the r-C4H9 ion to drift out of the ionization chamber. Thus 

We ignore the small error made by differences in drift velocities of t-C4H9 and ROAcH .  

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