Semi-infinite metal: thermodynamic potential and effective interionic pair potentials

A general expression for thermodynamic potential of semi-infinite metal is obtained. This expression has the form of expansion in powers of pseudo-potential degrees. It is shown, that multi-particle effective interionic potentials are necessary for calculation of the thermodynamic potential. The detailed analysis of interionic pair potential is made. The effect of geometrical limitation of metal on the behaviour of this potential is investigated.