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research article

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

Cannizzo, A.  
•
Leone, M.
•
Gawelda, W.  
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2008
Applied Physics Letters

The authors studied ultrafast relaxation of localized excited states at Ge-related O deficient centers in SiO2 using femtosecond transient-absorption spectroscopy. The relaxation dynamics exhibits a biexponential decay, which the authors ascribe to the departure from the Frank-Condon region of the 1st excited singlet state in 240 fs, followed by cooling in .apprx.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 intramol. vibrational redistribution. (c) 2008 American Institute of Physics.

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Type
research article
DOI
10.1063/1.2975965
Web of Science ID

WOS:000259797000067

Author(s)
Cannizzo, A.  
•
Leone, M.
•
Gawelda, W.  
•
Portuondo-Campa, E.  
•
Callegari, A.  
•
van Mourik, F.  
•
Chergui, M.  
Date Issued

2008

Published in
Applied Physics Letters
Volume

93

Issue

10

Start page

102901/1

End page

102901/3

Subjects

Excited state (localized; relaxation processes of point defects in vitreous silica from femtosecond to nanoseconds); Excited singlet state; Localized electronic state; Point defects; Vibrational relaxation (relaxation processes of point defects in vitreous silica from femtosecond to nanoseconds); Optical absorption (transient; relaxation processes of point defects in vitreous silica from femtosecond to nanoseconds)

•

relaxation point defect vitreous silica nanosecond

Note

CAN 149:520612

73-2

Optical, Electron, and Mass Spectroscopy and Other Related Properties

Dip. di Scienze Fisiche ed Astronomiche,Universita di Palermo,Palermo,Italy.

Journal

written in English.

7440-56-4 (Germanium) Role: MOA (Modifier or additive use), USES (Uses) (relaxation processes of point defects in vitreous silica from femtosecond to nanoseconds); 60676-86-0 Role: PEP (Physical, engineering or chemical process), PRP (Properties), PROC (Process) (relaxation processes of point defects in vitreous silica from femtosecond to nanoseconds)

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSU  
Available on Infoscience
March 18, 2009
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/36200
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