*Result*: A new analytical expression based on the one trap one recombination model to describe thermally assisted optically stimulated luminescence decay curves; simulation results and thermal assistance study.
*Further Information*
*Thermally assisted optically stimulated luminescence encompasses simultaneous thermal and optical stimulation, immediately after a thermoluminescence measurement up to 500 °C. While two different measuring modes were proposed, none of these was ever simulated so far. The present work attempts to fill this scientific hiatus by using the one trap one recombination model and Python programming language to generate both linear as well as isothermal TA - OSL decay curves. Analytical expressions using the unique master equation and the appropriate stimulation function were generated. For the case of linear TA - OSL, exploitation of common methods of kinetic analysis such as deconvolution using the Lambert W function, initial rise, various heating rate and peak shape methods is reported towards the calculation of the thermal assistance activation energy. The agreement between numerical and analytical TA - OSL models ensures that despite the fact that all methods work sufficiently, initial rise and deconvolution were proven to be the most reliable and accurate method for evaluating kinetic parameters for the case of linear TA - OSL peaks. For the case of isothermal TA - OSL, a specific protocol that simulates the measurement of this signal at incrementally increasing stimulation temperatures was implemented. The results indicate that calculation is more accurate when optical stimulation is faint. Finally, phototransfer thermoluminescence was studied as a proxy for the presence or absence of re-trapped photoionized electrons.
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*Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.*