Title: Semi-infinite metal: perturbative treatment based on semi-infinite jellium
Author(s):

	P.P. Kostrobij (Lviv Polytechnic National University, 12, S.Bandera Str., Lviv 79013, Ukraine) ,
	B.M. Markovych (Lviv Polytechnic National University, 12, S.Bandera Str., Lviv 79013, Ukraine)

Energy of electronic subsystem of semi-infinite metal is presented in the form of an expansion in powers of pseudo-potential. It is shown that generally electron many-particle density matrices are necessary for the energy calculation, whereas in case of a local pseudo-potential only diagonal elements (electron distribution functions) are necessary. In a specific case of a local pseudo-potential within the first order of perturbation theory, our results for energy coincide with those widely applicable in the density functional theory.

Key words: partition function, pseudo-potential, many-particle density matrix
PACS: 71.45.Gm, 71.10.-w, 73.20.-r

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