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RESEARCH PRODUCT
Photoconversion of F+ centers in neutron-irradiated MgO
J. E. Muñoz SantiusteRoberto GonzálezM.a MongeEugene A. KotominAnatoli I. PopovAnatoli I. PopovR ParejaY. Chensubject
Nuclear and High Energy PhysicsElectron transferPhotonImpurityChemistryNeutronIrradiationAtomic physicsLuminescenceInstrumentationExcitationIondescription
Abstract In neutron-irradiated MgO crystals, experiments and theory demonstrate that photon excitation of the positively charged anion vacancies (F+ centers) at 5.0 eV releases holes that are subsequently trapped at V-type centers, which are cation vacancies charge-compensated by impurities, such as Al3+, F−, and OH− ions. A photoconversion mechanism occurs very likely via electron transfer to F+ centers from the quasi-local states which are induced in the valence band. INDO quantum chemical simulations of F+ centers confirmed the appearance of two induced quasi-local states located at 1.2 and 2.0 eV below the top of the valence band.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-05-01 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |