General Aspects of High-Field Ion Mobility Standard and Nonstandard Effects

1 GENERAL ASPECTS OF HIGH-FIELD ION MOBILITY STANDARD AND NONSTANDARD EFFECTS 

The effect was observed to appear abruptly at some critical E/N value, E/N), specific to the ion/gas combination. The measured values of K above E/N)c appeared to fit 

FIGURE 2.1 Early measurements of K(E/N) in N2 at ambient conditions. (From Tyndall, A.M., The Mobility of Positive Ions in Gases, Cambridge University Press, Cambridge, U.K., 1938.) The Ejp units can be converted into Td by applying a factor of 3.1. 

The universal reason for deviations of K at high E/N from K(0) is the distortion of thermal statistics of collision velocities v ei by ion drift (1.3.9). That is the only possible cause for atomic ion/gas pairs, and molecular dynamics (MD) calculations 

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