El-Sayed, A-M;
Tanimura, K;
Shluger, AL;
(2015)
Optical signatures of intrinsic electron localization in amorphous SiO2.
Journal of Physics: Condensed Matter
, 27
(26)
10.1088/0953-8984/27/26/265501.
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Abstract
We measure and analyse the optical absorption spectra of three silica glass samples irradiated with 1 MeV electrons at 80 K, where self-trapped holes are stable, and use ab initio calculations to demonstrate that these spectra contain a signature of intrinsic electron traps created as counterparts to the holes. In particular, we argue that optical absorption bands peaking at 3.7, 4.7, and 6.4 eV belong to strongly localised electrons trapped at precursor sites in amorphous structure characterized by strained Si–O bonds and O–Si–O angles greater than 132°. These results are important for our understanding of the properties of silica glass and other silicates as well as the reliability of electronic and optical devices and for luminescence dating.
| Type: | Article |
|---|---|
| Title: | Optical signatures of intrinsic electron localization in amorphous SiO2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/0953-8984/27/26/265501 |
| Publisher version: | http://dx.doi.org/10.1088/0953-8984/27/26/265501 |
| Language: | English |
| Additional information: | Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| Keywords: | Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, electron traps, optical absorption, excited state, SELF-TRAPPED HOLES, SILICON DIOXIDE, GERMANIUM, QUARTZ, CENTERS, DENSITY, GLASSES, SURFACE, ATOMS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1479603 |
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