Motion of one species with respect to another is governed by their mutual interaction potential. Since ions are readily manipulated in electricfields, experimentalists since the end of the nineteenth century have been able to direct and watch the flow of ions through a neutral gas. From these studies much has been learned about the ion-neutral interaction potential. Knowledge of how an ion travels through a neutral gas is crucial to the understanding of such phenomena as electrical discharges, laser plasmas, and the aurora. Additionally, mobility measurements are essential for accurate modeling of the kinetics of ion-molecule reactions. Such reactions play a major role in the chemistry of the upperatmosphere. Interest in mobility experiments has recently also focused on structural determinations and separation techniques based on the often very different mobilities of structural isomers. See Clemmer, Mobilities: Biological systems and clusters. Thanks to the substantial efforts of several authors, comprehensive tables have been compiled summarizing the large amount of mobility data now available.
Encyclopedia of Mass Spectrometry
ion mobility, ion molecule reactions, ion-neutral interaction
and Leone, S.
Mobilities: Small Systems, Encyclopedia of Mass Spectrometry
(Accessed June 6, 2023)