Landolt-Börnstein - Group III Condensed Matter Applications of field desorption


This chapter discusses the application of field desorption. As is the case with the field ion microscope, the most widespread application of the atom-probe is in the area of metallurgy. The ability to carry out chemical analysis in a region of a sample specific to a particular structural feature makes the atom-probe ideally suited to investigate impurity and solute segregation to defects and well-defined interfaces. The atom-probe has also been used extensively to study the initial stages of phase transformations in metal alloys. In addition to metallurgy, the atom-probe has seen wide application in the area of surface science. Field-ion based techniques are particularly well suited to studies of catalytic reactions because the analyzed surface of the sample tip is a good model of the surface of a catalyst particle. In a manner analogous to field electron and field ion emission, field desorption can be used to produce a high-brightness source of ions. The most common source is the liquid-metal ion source in which a low melting-point metal such as gallium is used to wet a refractory metal. The source is operated at a temperature such that a continuous supply of the liquid metal is available at the tip apex. The applied field causes a cone or cusp to form at the surface of the liquid metal and ions are emitted. These ions can be focused to a very fine point. Commercial sources are now available and have been used in secondary ion mass spectrometers (SIMS) and ion microscopes.

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Title Applications of field desorption
Book Title
Interaction of Radiation with Surfaces and Electron Tunneling
In Field desorption
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Chapter DOI
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Landolt-Börnstein - Group III Condensed Matter
  • G. Chiarotti
  • Authors
  • G. L. Kelwog
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