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Abstract
AbstractThe optical transformation and thermal stability of Ag centres in KCl:Ag crystals stabilized in different valence states after X‐irradiation are studied using thermoluminescence (TL) as the tool. The much higher sensitivity of TL over optical absorption enables to monitor the transformation processes with the help of the data obtained from TL spectra. It is shown that the 555 nm recombination luminescence emission predominant in the 90 °C glow peak is due to Ag0 atoms at cation sites while the 543 nm emission predominant in the 135 °C glow peak is due to Ag+k: F centre complex. The results further reveal that electrons trapped by Ag+ ions during X‐irradiation are mostly not destroyed during optical bleaching but undergo transformation and stabilize the Ag+ ions in different valence states both in cationic and anionic sites. Results also indicate that Ag0 atoms in anion sites are non‐thermoluminescent.
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