Abstract

AbstractThe cohesive energy of solids of calculated by using a statistical model in which both the exchange and the Coulomb correlations are included. The model takes into account the local lowering of the electron density due to the finite volume of the exchange and coulomb correlation holes produced in the electron gas of the statistical atomic system.The cohesive energy and atomic volume are estimated numerically for elements with atomic numbers Z varying from 1 to about 30, and those are compared with the corresponding average experimental dependences on Z. Rather good agreement between theory and experiment is obtained for the cohesive energy if only the exchange correlations are considered. The introduction of the Coulomb correlations increases the cohesive energy about one third of the value obtained by the use of exchange correlations alone.

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