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Applied Physics A

, Volume 41, Issue 3, pp 223–232 | Cite as

On the mechanism of liquid metal ion sources

  • L. W. Swanson
  • D. R. Kingham
Surfaces, Interfaces, and Layer Structures

Abstract

We have developed a theoretical model of liquid metal ion source operation which consistently explains the shape and size of the ion emitting region, the mechanism of ion formation and properties of the ion beam. We find that field evaporation is the main current generating mechanism and that field evaporation and subsequent postionization produce the doubly and higher charged ions. Field ionization of thermally evaporated neutrals may make a significant, but not dominant, contribution to the current of singly charged ions. Our model is consistent with experimental results on energy spread, energy deficit and charge state ratios and we are able to explain the stability of the emitted ion current.

PACS

79.70.+q 41.80.Gg 07.80.+x 

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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • L. W. Swanson
    • 1
  • D. R. Kingham
    • 2
  1. 1.Oregon Graduate CenterBeavertonUSA
  2. 2.Cavendish LaboratoryCambridgeUK

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