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Electrons in feldspar II: a consideration of the influence of conduction band-tail states on luminescence processes |
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| Authors: | N R J Poolton K B Ozanyan J Wallinga A S Murray L Bøtter-Jensen |
| Institution: | Synchrotron Radiation Department, Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, England e-mail: n.r.j.poolton@dl.ac.uk, GB Department of Electrical Engineering and Electronics, UMIST, PO Box 88, Manchester M60 1QD, England, GB The Netherlands Centre for Geo-Ecological Research (ICG), Faculty of Geographical Sciences, Utrecht University, PO Box 80115, 3508 TC, Utrecht, The Netherlands, NL Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Ris? National Laboratory, 4000 Roskilde, Denmark, DK Nuclear Safety Research Department, Ris? National Laboratory, 4000 Roskilde, Denmark, DK |
| Abstract: | Most natural feldspars contain many charged impurities, and display a range of bond angles, distributed about the ideal. These effects can lead to complications in the structure of the conduction band, giving rise to a tail of energy states (below the high-mobility conduction band) through which electrons can travel, but with reduced mobility: transport through these states is expected to be thermally activated. The purpose of this article is twofold. Firstly, we consider what kind of lattice perturbations could give rise to both localized and extended conduction band-tail states. Secondly, we consider what influence the band tails have on the luminescence properties of feldspar, where electrons travel through the sample prior to recombination. The work highlights the dominant role that 0.04–0.05-eV phonons play in both the luminescence excitation and emission processes of these materials. It also has relevance in the dating of feldspar sediments at elevated temperatures. Received: 11 May 2001 / Accepted: 6 September 2001 |
| Keywords: | Feldspar Luminescence Hopping transport Mobility edge Effective mass |
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