Cálculo da taxa de ioniza？？o por campo de um átomo próximo a uma superfície metálica: aplica？？o ao microscópio i？nico de campo

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.