Pulsed infrared stimulated luminescence measurements for defect pair model studies in feldspars

Abstract

We present a time-resolved experimental study of feldspar infrared stimulated luminescence (IRSL) as part of a defect pair model investigation of the underlying mechanisms. Within our investigation we recorded ultraviolet emissions that covered a diverse range of alkali feldspars together with a limited selection of plagioclase feldspars. In analysing our measurements, we find that each IRSL pulse response is characterised by a combination of fast and slow components, the relative proportions of which vary across the range of feldspars we tested. We interpret the presence of the components as providing evidence as to the dual roles played by high mobility electrons and by the less mobile alkali ions that are released during the underlying physical processes. Consistent with earlier data, we find further that the luminescent sensitivities vary widely across the range of feldspars we tested.