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The Van Hove Diagonality Conditions and the Ionic Configuration Average in the Theory of Liquid Metals
Author(s) -
Schaich W. L.
Publication year - 1974
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220640228
Subject(s) - generality , perturbation theory (quantum mechanics) , ionic bonding , momentum (technical analysis) , physics , matrix (chemical analysis) , theoretical physics , statistical physics , mathematics , quantum mechanics , materials science , ion , psychology , psychotherapist , finance , economics , composite material
The justification of the ionic configuration average within the limitation of infinite order perturbation theory is considered. The diagonality conditions of Van Hove are shown to result from this average if the momentum matrix elements are appropriately coarse grained. An omission in a previous proof of these conditions is thereby rectified. Finally a comment is made on the generality of the results.