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Title

Relaxation processes of point defects in vitreous silica from femtosecond to nanoseconds

AuthorsCannizzo, A.; Leone, M.; Gawelda, W.; Portuondo-Campa, E.; Callegari, A.; Van Mourik, F.; Chergui, M.
Issue Date2008
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 93: 102901 (2008)
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.
URIhttp://hdl.handle.net/10261/61622
DOI10.1063/1.2975965
Identifiersdoi: 10.1063/1.2975965
issn: 0003-6951
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