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Polarized Luminescence of Lead Ions Associated with Interstitial Radiation Defects in KCl:PbCl 2 Crsytals
Author(s) -
Egemberdiev Zh.,
Zazubovich S.,
Nagirnyi V.
Publication year - 1982
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221090119
Subject(s) - ion , chemistry , vacancy defect , absorption (acoustics) , absorption band , irradiation , atom (system on chip) , luminescence , atomic physics , analytical chemistry (journal) , crystallography , materials science , physics , optoelectronics , computer science , nuclear physics , embedded system , optics , composite material , organic chemistry , chromatography
Two types of lead ion and interstitial chlorine atom associates (H z (Pb 2+ ) centres) are found and investigated by optical methods in X‐irradiated KCl:PbCl 2 crystals. The polarized 3.35 and 1.8 eV emission of these centres and the absorption bands near 5.55 and 4.4 eV are caused by electronic transitions in the Pb 2+ ion perturbed by Cl 2 −molecular ion, which occupies a cation vacancy and an anion site. The broad absorption band at 3.7 eV is due to the transitions in the Cl 2 −ion perturbed by Pb 2+ . Using the ESR data obtained by Schoemaker et al. it is concluded that the centres with 3.35 and 1.8 eV emission are interstitial chlorine atoms trapped by Pb 2+ ions associated with the nearest neighbouring (H z [110] (Pb 2+ ) centres) and with the next nearest neighbouring (H z [100] (Pb 2+ ) centres) cation vacancies, respectively. Lead ion and Cl 3 −molecular ion associates (V 2z (Pb 2+ ) centres) are found. The polarized 3.05 eV emission and the 4.3 eV absorption band of these centres are caused by the electronic transitions in Pb 2+ ions perturbed by Cl 3 − . The broad 5.27 eV absorption band is due to the electronic transitions in the Cl 3 −ions perturbed by Pb 2+ . It is assumed that the V 2z (Pb 2+ ) centre may be represented as a Cl 3 −molecular ion which occupies two anion and one cation sites and is associated with a Pb 2+ ion located (according to Itoh et al.) at a face‐centred position as well as with an interstitial chlorine ion and cation vacancy.