# Stability of E' centers induced by 4.7eV laser radiation in SiO2

Source: [Stability of E' centers induced by 4.7eV laser radiation in SiO2](<https://www.sota2.com/research/paper/68fa28182c2a3760193c6cb6>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T12:15:28.647Z

Authors: F. Messina, M. Cannas

Published: 2007-03-02T14:07:25.000Z

## Abstract

The kinetics of E' centers (silicon dangling bonds) induced by 4.7eV pulsed laser irradiation in dry fused silica was investigated by in situ optical absorption spectroscopy. The stability of the defects, conditioned by reaction with mobile hydrogen of radiolytic origin, is discussed and compared to results of similar experiments performed on wet fused silica. A portion of E' and hydrogen are most likely generated by laser-induced breaking of Si-H precursors, while an additional fraction of the paramagnetic centers arise from another formation mechanism. Both typologies of E' participate to the reaction with H\_2 leading to the post-irradiation decay of the defects. This annealing process is slowed down on decreasing temperature and is frozen at T=200K, consistently with the diffusion properties of H\_2 in silica.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/cond-mat/0703066>)

[PDF](<https://arxiv.org/pdf/cond-mat/0703066.pdf>)