The relationship between thermal activation energy,infrared stimulated luminescence and anomalous fading of K-feldspars |
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Authors: | Bo Li |
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Institution: | Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China |
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Abstract: | A strong dependence of thermal activation energy (TAE) on infrared (IR) stimulation time for the infrared stimulated luminescence (IRSL) signal was observed for K-feldspar grains extracted from several sediments and granites from China. A TAE value as low as ~0.1 eV was observed at the beginning of IR stimulation and increased to ~0.45 eV after 90 s. For a trap depth of ~2 eV below the conduction band for the IRSL traps, the TAE value of ~0.45 eV is consistent with the energy gap between the excited states (~0.5 eV below the conduction band) and conduction band. This phenomenon is explained as the result of the coexistence of thermally assisted recombination via conduction band or band-tail states hopping and athermal tunnelling recombination of electrons from the excited states under IR stimulation, leading to the observation of a higher anomalous fading rate in the initial part of the IRSL decay curve. |
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