Anomalous regeneration of OSL in sodium chloride – Experiment and modeling

摘要: Abstract Recently, a new optical phenomenon was observed in sodium chloride (NaCl). Performing series of optically stimulated luminescence (OSL) readouts it found that subsequent OSL decay, after some delay, starts from significantly higher intensity level than the final previous readout. This unusual behavior called ‘regeneration effect’ (Biernacka and Mandowski, 2013). Regeneration occurs spite significant fading – well known this material. Nevertheless, these two contradictory processes take place different time scales. Previously, proved also, regeneration cannot be explained on basis classical simple trap model (STM). paper analyses optimal measurement conditions leading to highest effect. It increase could as high 190%. A phenomenological explaining mechanism is proposed. The involves simultaneous localized delocalized (i.e. band-like) transitions. Characteristic lifetimes are order 560 s 22000 s, respectively.