Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 562232
Title Electrons in feldspar I : On the wavefunction of electrons trapped at simple lattice defects
Author(s) Poolton, N.R.J.; Wallinga, J.; Murray, A.S.; Bulur, E.; Bøtter-Jensen, L.
Source Physics and Chemistry of Minerals 29 (2002)3. - ISSN 0342-1791 - p. 210 - 216.
DOI https://doi.org/10.1007/s00269-001-0217-3
Publication type Refereed Article in a scientific journal
Publication year 2002
Keyword(s) Defects - Effective mass - Feldspar - Luminescence - Wavefunction
Abstract

The purpose of this article is to make an initial consideration of the physical properties of electrons trapped at classic hydrogenic lattice defects in feldspar. We are particularly interested to determine the radial extent of the electron wavefunctions in the ground and excited states. It is shown that for NaAlSi3O8, the ground-state wavefunction is expected to be confined well within a single lattice unit cell, but the first excited state is far more extensive, being spread over several unit cells. This aspects is of direct relevance to understanding the nature of various luminescence processes in the materials. Under low-energy optical stimulation (hv ∼ 1.4 eV), luminescence can be a competitive process between direct electron-hole tunnelling recombination (with the charge still trapped at the defect sites), and free-to-bound recombination (after the excited state electron accesses the conduction band). We show that analysis of the thermal behaviour of the luminescence can be used to separate the two processes.

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