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Article | REF: P900 V2

Atom probe tomography APT

Authors: Didier BLAVETTE, François VURPILLOT, Bernard DECONIHOUT

Publication date: December 10, 2013

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1. Field-effect evaporation

The principle of the tomographic atom probe is based on the ionization and field evaporation of atoms on the surface of a material.

The sample, cut in the form of a fine tip, is raised to a high positive potential V of several kilovolts (figure 1 ). The electric field thus generated at the tip is of the form :

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