Artigo de Periódico
Image potential and local field effects on ionization rates in the field ion microscope
Fecha
1993Autor
Castilho, Caio Mário Castro de
Andrade, Roberto Fernandes Silva
Sousa, C. T.
Castilho, Caio Mário Castro de
Andrade, Roberto Fernandes Silva
Sousa, C. T.
Institución
Resumen
Effects of blh the local field and the image potential are taken into account in
the determination of the ionization mer of the imaging gas in the Eeld ion miaompe.
The model consists of a half-sphere superimposed on a Rat surface and the mults
were obtained after the ~WKB scheme. In comparison with the more usual mdses, where
only the external 6eld and the atom potential are considered, the wmll eEeR is to
Marrow the ionization wne and Io decrease the ionimtion rate, except for the pan of
the ionization zone closer1 10 Ihe surface.