# H(II) centers in natural silica under repeated UV laser irradiations

Source: [H(II) centers in natural silica under repeated UV laser irradiations](<https://www.sota2.com/research/paper/68fa26892c2a3760193bae53>)

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

Data updated: 2025-10-24T11:27:12.027Z

Authors: F.Messina, M.Cannas, R.Boscaino

Published: 2004-10-22T17:14:43.000Z

## Abstract

We investigated the kinetics of H(II) centers (=Ge'-H) in natural silica under repeated 266nm UV irradiations performed by a Nd:YAG pulsed laser. UV photons temporarily destroy these paramagnetic defects, their reduction being complete within 250 pulses. After re-irradiation, H(II) centers grow again, and the observed recovery kinetics depends on the irradiation dose; multiple 2000 pulses re-irradiations induce the same post-irradiation kinetics of H(II) centers after each exposure cycle. The analysis of these effects allows us to achieve a deeper understanding of the dynamics of the centers during and after laser irradiation.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/cond-mat/0410584>)

[PDF](<https://arxiv.org/pdf/cond-mat/0410584.pdf>)