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

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

2004-10-22

arxiv.org/abs/cond-mat/0410584v1

J. Non-Cryst. Solids 351, 2005, 1770

Physics

Condensed Matter

Materials Science

Submitted to Journal of Non Crystalline Solids

Scientific paper

10.1016/j.jnoncrysol.2005.04.012

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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