Configurational instability at the excited impurity ions in alkaline earth fluorites

Details Configurational instability at the excited impurity ions in alkaline earth fluorites Configurational instability at the excited impurity ions in alkaline earth fluorites

2012-04-01

arxiv.org/abs/1204.0256v1

Physics

Condensed Matter

Materials Science

10 pages, 2 Figures, article

Scientific paper

The formation of intrinsic defects by ionizing radiation in some ionic crystals in the anion sublattice is only associated with the instability of the self-trapped exciton up to now. In this paper we propose a new mechanism for the formation of the defects in the anion sublattice associated with the Janh-Teller instability occurring near the cation impurities in the excited state. The instability occurs when the degenerate excited state of the impurity ion is localized in the conduction band. We believe that the configuration interaction between the discrete impurity level and host continuum (effect Fano) plays an important role in this process.

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