Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSousa Romero, Carmen-
dc.contributor.authorIllas i Riera, Francesc-
dc.description.abstractA systematic study of the different computational requirements that affect the accuracy of the ab initio prediction of excitation energies of F and F+ centers on cluster models of MgO is reported. It is found that rather limited basis sets are enough to predict excitation energies of the F and F+ centers that are near to each other as experimentally observed. However, the absolute value of the excitation energy is in error by ∼1 eV or ∼20%. Increasing the basis set reduces the calculated excitation energy for the allowed transition, reaching a value of 5.44 eV for the F center, only 9% in error with respect to experiment. Improving the basis set does not result in a better value of the excitation energy of the charged F+ center. Attempts to improve the calculated result by geometry optimization of the region near the oxygen vacancy, enlarging the cluster model, improving the primitive Gaussian set, or enlarging the auxiliary basis set centered on the vacancy failed to further reduce the error. It is concluded that much larger basis sets are required to predict excitation energies of electrons trapped at oxygen vacancies in ionic oxides with accuracy of or better than 0.4 eV.-
dc.format.extent5 p.-
dc.publisherAmerican Institute of Physics-
dc.relation.isformatofReproducció del document publicat a:
dc.relation.ispartofJournal of Chemical Physics, 2001, vol. 115, num. 3, p. 1435-1439-
dc.rights(c) American Institute of Physics , 2001-
dc.subject.classificationDefectes cristal·lins-
dc.subject.otherCrystals defects-
dc.titleOn the accurate prediction of the optical absorption energy of F-centers inMgO from explicitly correlated ab initio cluster model calculations-
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

Files in This Item:
File Description SizeFormat 
178140.pdf57.82 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.