Abstract
We report experimental data on two types of natural silica, differing in their OH content, irradiated with UV photons (4.66 eV)from a pulsed Nd:YAG laser. Irradiation induces a reduction of the absorption band at 5.12 eV and of the associated emissions at3.14 eV and 4.28 eV, ascribed to twofold coordinated Ge(@Ge) centers pre-existing in our samples. The bleaching is mainly due tothe post-irradiation conversion of @Ge into the paramagnetic H(II) center via trapping of a H atom. Comparison with literaturedata points out the peculiarities of silica with a low Ge concentration as regards UV-induced transformations.
Lingua originale | English |
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pagine (da-a) | 433-437 |
Numero di pagine | 5 |
Rivista | Journal of Non-Crystalline Solids |
Volume | 345-346 |
Stato di pubblicazione | Published - 2004 |
All Science Journal Classification (ASJC) codes
- ???subjectarea.asjc.2500.2504???
- ???subjectarea.asjc.2500.2503???
- ???subjectarea.asjc.3100.3104???
- ???subjectarea.asjc.2500.2505???