Abstract
The luminescence signals from several important dosimetric materials cannot be described by using the delocalized transitions models we saw in the previous chapters. Instead, the luminescence mechanism in these materials involves localized transitions, which do not involve the conduction and valence bands. In this chapter we consider several types of models which are based on localized quantum tunneling transitions. We describe four such models: the ground state tunneling model (GST), the irradiation ground state tunneling model (IGST), excited state tunneling model (EST) and thermally-assisted excited state tunneling models (TA-EST). We provide Python codes for exploring the properties of each model, discuss their physical principles, and present approximate analytical solutions to the differential equations describing each model. The main physical concept in these models is that changes take place in the nearest neighbor distribution in a random distribution of defects in a solid. We discuss the g-factor for the anomalous fading phenomenon (AF) of luminescence signals, and present the general analytical Kitis-Pagonis TL equations (KP-TL). We provide an overview of the KP-TL, KP-ITL, KP-CW and KP-LM equations for analysis of TL, ITL, CW-OSL/CW-IRSL and LM-OSL/LM-IRSL signals. Finally we discuss the TA-EST model which can be used in low temperature thermochronometry studies. In the next chapter we apply the models and equations presented in this chapter to analyze TL signals from dosimetric materials.
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Pagonis, V. (2022). TL from Quantum Tunneling Processes: Models. In: Luminescence Signal Analysis Using Python. Springer, Cham. https://doi.org/10.1007/978-3-030-96798-7_4
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DOI: https://doi.org/10.1007/978-3-030-96798-7_4
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