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The intrasite e-e interaction is included within the band structure model by means of a first principles pseudopotential method which is valid for integral and non integral configuration. The pseudopotential is applied to Yb,O, appearing in the semiconducting phase when one takes into account the screened 4 f 4 f interaction. The conduction band after the metal-semiconductor transition corresponds to the fulfilled 4f shell and this seems clearly mixed with the p, d bands. Moreover, the mechanism is analyzed for the delocalization and spread of the 4f excited states.Die Intraplatz-e-e-Wechselwirkung wird in das Bandstrukturmodell mittels einer ,,first-prin-cip1es"-Pseudopotentialmethode einbezogen, die fur integrale und nichtintegrale Konfiguration gultig ist. Das Pseudopotential wird auf Yb,O, angewendet, das in der halbleitenden Phase auftritt, wenn die abgeschirmte 4f4f-Wechselwirkung berucksichtigt wird. Nach dem Metall-Halbleiterubergang entspricht das Leitungsband der gefullten 4f-Schale und diese scheint merklich mit den p, d-Bandern gemischt zu sein. Daruber hinaus wird der Mechanismus fur die Delokalisierung und Verbreiterung der angeregten 4f-Zusfande analysiert.

Abstract-The objective of this paper is to establish the properties of the electromagnetic wave propagation in a diversity of situations in material media with magnetic monopoles and even in the situations of entities simultaneously containing electric and magnetic charges. This analysis requires the knowledge and solutions of the "Maxwell" equations in material media compatible with the existence of magnetic monopoles and the extended concepts of linear responses (conductivity, split-charge susceptibility, kinetic susceptibility, permittivity and magnetic permeability) in the case of presence of electric and magnetic charges. This analysis can facilitate insights and suggestions for electrical and optical experiments affording a better knowledge of the materials whose behaviour can be analyzed under the consideration of the existence of entities with equivalent properties of the magnetic monopoles.

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