| Abstract
| - A semiempirical method for the evaluation of the barycenter of energy of 4fN-15d configurations is presented.The environmental factors affecting the barycenter are given to be the bond volume polarization, fractionalcovalence of the chemical bond between the central ion and the nearest anion, and presented charge of thenearest anion in the chemical bonds. The barycenter energies of 4fN-15d configurations of Eu2+ and Ce3+ arecalculated in various crystals, and the results are in good agreement with the experimental values. A relationshipis found between the barycenter of energy of the 4fN-15d configuration on Eu2+ and Ce3+ ions andenvironmental factors. Our method offers the advantage of applicability to a broad class of luminescencematerials and initiates a link between macroscopic properties and microscopic structure.
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