Explanation of the T- and X-line components of the emission of ns2 impurity ions in alkali halides by lattice relaxation studies

Autor:	J. Andriessen, C.W.E. van Eijk
Rok vydání:	2002
Předmět:	Physics Nuclear and High Energy Physics Impurity Excited state Lattice (order) Jahn–Teller effect Electronic structure Emission spectrum Atomic physics Instrumentation Magnetic impurity Ion
Zdroj:	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 486:403-407
ISSN:	0168-9002
DOI:	10.1016/s0168-9002(02)00742-8
Popis:	Accurate lattice relaxation studies were performed on the impurity centres Ga, In and Tl in FCC KCl, when these ions are excited from the ground ns 2 state to the triplet nsnp state. Using HF-LCAO as the basic model for the electronic structure a satisfying explanation was found for the T-lines of the three impurity ions. Particularly this is hard for thallium where there is a strong competition between lattice relaxation and the quenching of the spin-orbit interaction. An unexpected explanation was found for the X-type emission line of which the centre geometry is unknown. It is very likely emitted from a centre where the impurity ion is displaced over a long distance in one of the (1 1 1) directions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ca7d6a25690bf6b96e13b7449e909e4c https://doi.org/10.1016/s0168-9002(02)00742-8 Zobrazit plný text záznamu Full Text from ScienceDirect