High-Field Ion Diffusion in Gas Mixtures

As discussed in 2.2.4, understanding the diffusion at high E/N is cmcial to the advance of differential IMS. At E/N) 0, both Dy and (2.2.4) in mixtures also deviate from Equation 2.46. Substitution of Equations 2.22 and 2.23 into Equation 2.49 yields, respectively  

Unlike the parallel equation 2.49 for ifniix. Equations 2.55 and 2.56 contain the directional ion temperatures. Their evaluation for pure gases involves approximations and semiempiric parameters (2.2.4), and the situation for gas mixtures is yet more comphcated. 

the product F (x)M in Equation 2.27 must be replaced by its average for the 

59 is an iterative process (2.4.1). As with the Equation 2.53 for there is an explicit linearized solution  

Here A, is by Equation 2.54, T (x),mix are still given by Equations 2.57 through 2.59, )8 is treated as above (with P = 0), but the weighing factors for component gas 

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