Field evaporation of the compound emitters at the various temperatures

Field evaporation process of the compounds emitters, which consist the elements with the various values of the ionization potentials In has complicated nature. According to classical theory of a field evaporation of metals, the atoms with various In must be evaporated at various evaporation fields Fev and the atoms with large In must be accumulated on an emitter surface. But according to experiments a field evaporation of the compound emitters leads to an evaporation of the elements at the same value Fev, the atoms are evaporated as atomic or cluster ions and an accumulation of the atoms with large In is not observed. The evaporation mechanism for the atomic ions may be explained as follows, an evaporation of the easy ionized elements leads to decrease of a binding energy of the hard ionized elements and to decrease their values of Fev. The explanation may be problematical for the more complicated mechanism of the cluster field evaporation. (authors)