Summary and Prognosis

  • Larry A. ViehlandEmail author
Part of the Springer Series on Atomic, Optical, and Plasma Physics book series (SSAOPP, volume 105)


Gaseous ion mobility, diffusion, and reaction have been studied by swarm techniques for about 120 years. As illustrated in Chap.  1, many important things have been discovered, including the existence of electrons, ions, and isotopes; a verification of quantum mechanics by its use in distinguishing the mobilities of 4He2\(^{+}\) and 4He\(^{+}\)(2S1/2) in 4He(1S0); the NTE equation relating the mobility and diffusion coefficient at low \(E/n_{0}\); the tensorial rather than scalar nature of the diffusion coefficients; and the usefulness of DTMS for studying ion–neutral reactions at intermediate energies. So many of these discoveries happened so long ago that scientists often assume that there is little more to be done, despite the many experimental techniques that have been introduced in recent years. These are described in Chap.  2.

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© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Science DepartmentChatham UniversityPittsburghUSA

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