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## Revista Brasileira de Ensino de Física

*Print version* ISSN 1806-1117

#### Abstract

SILVA, Ariel Almeida Abreu and ANDRADE-NETO, A.V.. **Calculating the field ionization of an atom near a metal surface**: **application to the field ion microscope**.* Rev. Bras. Ensino Fís.* [online]. 2012, vol.34, n.1, pp. 1-5. ISSN 1806-1117. http://dx.doi.org/10.1590/S1806-11172012000100004.

In this work we calculate the ionization rate constant (ionization probability per unit of time) as a function of the applied field (we assume a uniform field) and the atom's distance from the metal surface. In order to calculate the probability of barrier penetration we use semiclassical (WKB)approximation. We utilize one-dimensional model potential which is chosen to be a good physical representation of the real system. In addition, the field ion microscope is approached in a elementary way.

**Keywords
:
**field ionization; field ion microscopy; WKB approximation.