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dc.contributor.authorCannizzo, A.-
dc.contributor.authorLeone, M.-
dc.contributor.authorGawelda, W.-
dc.contributor.authorPortuondo-Campa, E.-
dc.contributor.authorCallegari, A.-
dc.contributor.authorVan Mourik, F.-
dc.contributor.authorChergui, M.-
dc.date.accessioned2012-11-30T11:41:42Z-
dc.date.available2012-11-30T11:41:42Z-
dc.date.issued2008-
dc.identifierdoi: 10.1063/1.2975965-
dc.identifierissn: 0003-6951-
dc.identifier.citationApplied Physics Letters 93: 102901 (2008)-
dc.identifier.urihttp://hdl.handle.net/10261/61622-
dc.description.abstractWe studied ultrafast relaxation of localized excited states at Ge-related oxygen deficient centers in silica using femtosecond transient-absorption spectroscopy. The relaxation dynamics exhibits a biexponential decay, which we ascribe to the departure from the Frank-Condon region of the first excited singlet state in 240 fs, followed by cooling in ∼10 ps. At later times, a nonexponential relaxation spanning up to 40 ns occurs, which is fitted with an inhomogeneous distribution of nonradiative relaxation rates, following a chi-square distribution with one degree of freedom. This reveals several analogies with phenomena such as neutron reactions, quantum dot blinking, or intramolecular vibrational redistribution. © 2008 American Institute of Physics.-
dc.language.isoeng-
dc.publisherAmerican Institute of Physics-
dc.rightsopenAccess-
dc.titleRelaxation processes of point defects in vitreous silica from femtosecond to nanoseconds-
dc.typeartículo-
dc.identifier.doi10.1063/1.2975965-
dc.date.updated2012-11-30T11:41:42Z-
dc.description.versionPeer Reviewed-
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