Photostimulated Reorientation of H (Pb2+) Centres in a KCl:PbCl2 Crystal

✍ Scribed by V. Nagirnyi; T. Soovik; S. Zazubovich

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 487 KB
• Volume: 125
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2221250115

✦ Synopsis

Abstract

Temperature dependences of polarization and kinetic characteristics of luminescence are investigated for Pb^2+^ ions perturbed by a (nnn) cation vacancy and an interstitial chlorine atom (H(Pb^2+^) centres) in a KCl:PbCl~2~ crystal. At T > 110 K the reorientation of these centres in the triplet excited state of the Pb^2+^ ion stimulated by polarized UV radiation becomes evident in the polarization spectra and decay kinetics of the A~T~ emission. It results neither in the depolarization of the emission nor in the „alignment”︁ of the centres. Most probably the effect can be explained by a strong covalent interaction between the excited Pb^2+^ ion and an interstitial, and it is caused by the dissociation of the two‐component defect near the Pb^2+^ ion and the following jump of the interstitial chlorine atom into one of the 〈100〉 directions perpendicular to the {Pb^2+^‐v} axis.