Modeling of the shape of infrared stimulated luminescence signals in feldspars

Vasilis Pagonis, Mayank Jain, Andrew S. Murray, Christina Ankjærgaard, Reuven Chen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    This paper presents a new empirical model describing infrared (IR) stimulation phenomena in feldspars. In the model electrons from the ground state of an electron trap are raised by infrared optical stimulation to the excited state, and subsequently recombine with a nearest-neighbor hole via a tunneling process, leading to the emission of light. The model explains the experimentally observed existence of two distinct time intervals in the luminescence intensity; a rapid initial decay of the signal followed by a much slower gradual decay of the signal with time.The initial fast decay region corresponds to a fast rate of recombination processes taking place along the infrared stimulated luminescence (IRSL) curves. The subsequent decay of the simulated IRSL signal is characterized by a much slower recombination rate, which can be described by a power-law type of equation.Several simulations of IRSL experiments are carried out by varying the parameters in the model. It is found that the shape of the IRSL signal is remarkably stable when the kinetic parameters are changed within the model; this is in agreement with several previous studies of these signals on feldspars, which showed that the shape of the IRSL curves does not change significantly under different experimental conditions. The relationship between the simulated IRSL signal and the well-known power-law dependence of relaxation processes in solids is also explored, by fitting the IRSL signal at long times with a power-law type of equation. The exponent in this power-law is found to depend very weakly on the various parameters in the model, in agreement with the results of experimental studies. The results from the model are compared with experimental IRSL curves obtained using different IR stimulating power, and good quantitative agreement is found between the simulation results and experimental data.
    Original languageEnglish
    JournalRadiation Measurements
    Volume47
    Issue number9
    Pages (from-to)870-876
    ISSN1350-4487
    DOIs
    Publication statusPublished - 2012
    Event13th International Conference on Luminescence and Electron Spin Resonance Dating - LED 2011 - Torun, Poland
    Duration: 10 Jul 201114 Jul 2011

    Conference

    Conference13th International Conference on Luminescence and Electron Spin Resonance Dating - LED 2011
    CountryPoland
    CityTorun
    Period10/07/201114/07/2011

    Keywords

    • Infrared stimulated luminescence
    • IRSL
    • Feldspars
    • Power law of luminescence
    • Kinetic rate equations
    • Kinetic model
    • Tunneling

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