Paradigm of Differential IMS in Asymmetric Electric Field

One can break K(E) into the field-independent part Kp at some fixed Ep and variable part associated with the deviation of E from Ep.  

Then the drift velocity f of an ion by Equation 1.8 and its displacement d by Equation 1.11 can also be broken into fixed and field-dependent parts  

Our focus will be on the functional form of E i), so it is convenient to normalize  

is the peak absolute E t) amplitude (dispersion field) Fit) defines the profile 

To measure the difference between K at two E, one must sent ions on paths where, at some time the first but not the second term on the rhs of Equation 

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