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 562022
Title Direct evidence for the participation of band-tails and excited-state tunnelling in the luminescence of irradiated feldspars
Author(s) Poolton, N.R.J.; Kars, R.H.; Wallinga, J.; Bos, A.J.J.
Source Journal of Physics-Condensed Matter 21 (2009)48. - ISSN 0953-8984
Publication type Refereed Article in a scientific journal
Publication year 2009

The significance and extent of band-tail states in the luminescence and dosimetry properties of natural aluminosilicates (feldspars) is investigated by means of studies using low temperature (10K) irradiation and optically stimulated luminescence (OSL) stimulation spectroscopy, and thermoluminescence (TL) in the range 10-200K, made in comparison with high temperature (300K) irradiation and photo-transferred OSL and TL investigations undertaken at low temperature. These measurements allow mappings of the band-tails to be made; they are found to be ∼0.4eV in extent in the typical materials studied. Furthermore, by populating charge trapping centres at high temperature (300K) and monitoring the OSL stimulation spectra at temperatures in the range 10-300K, clear evidence is presented for the presence of both thermally activated and non-thermally activated OSL processes; it is argued that the former result from thermally activated hopping through the band-tail states, whilst the latter are due to tunnelling processes, either from the excited state of the OSL centres or through the tail states. The spectral measurements are supported by analysis of the temporal dependence of the OSL signals, which correspond to either tunnelling or general order kinetic decay processes.

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