Abstract Low frequency modes were observed in a series of alkali halides doped with lead after X-irradiation at 77K. The peak positions of the Raman signals are at 34cm-1 for NaCl:Pb2+, 30cm-1 for KCl:Pb2+,28cm-1 for RbCl:Pb2+ and 22cm-1 for KBr:Pb2+. They are assigned to the inelastic light scattering caused by the local vibration of $X^-_i$(Pb+) center, which consists of an interstitial halogen ion stabilized by a substitutional ion Pb+ . Polarized Raman measurements and Behavior Typer(BT) analysis show that the symmetry of the $X^-_i$ (Pb+) center belongs to the point group C3v. A structure model of the $X^-_i$ (Pb+) center is proposed based on the Raman data and the result of BT analysis.
Received: 18 March 1992
Accepted manuscript online:
WANG YING-ZONG (王应宗) RAMAN STUDY ON $X_i^-$(Pb) CENTERS IN SINGLE CRYSTALS OF ALKALI HALIDES DOPED WITH LEAD 1993 Acta Physica Sinica (Overseas Edition) 2 120
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
