Transformations of Absorption and Emission Centers in

Transformations of Absorption and Emission Centers in

Non-stoichiometric PWO crystals were studied at annealing experiments in various atmospheres. It was found that a substantial part of absorption centers in the PWO platelets was brought into absorption activity due to mechanical processing of their surfaces. The green emission of the type G(II) is c...

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Veröffentlicht in:IEEE transactions on nuclear science 2008-06, Vol.55 (3), p.1289-1294
Hauptverfasser: Bohacek, P., Solovieva, N., Nikl, M.
Format: Artikel
Sprache:eng
Schlagworte:
Absorption centers
Annealing
Atmosphere
Conditioning
Crystalline materials
Crystals
Electromagnetic wave absorption
Emission
emission centers
Lead
lead tungstate non-stoichiometric crystals
oxygen interstitials
Physics
Scintillation counters
Separation
Surface chemistry
Temperature
Transformations
Vacancies
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Beschreibung
Zusammenfassung:Non-stoichiometric PWO crystals were studied at annealing experiments in various atmospheres. It was found that a substantial part of absorption centers in the PWO platelets was brought into absorption activity due to mechanical processing of their surfaces. The green emission of the type G(II) is conditioned by presence of mechanical tension at the emission centers. A new process found at annealing is the transformation of the 330/355 centers into the 340/430 centers caused by separation of lead vacancies from the former ones.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2007.914370