Modeling the crystal-field splitting of energy levels of Er<superscript>3+</superscript>(4f<superscript>11</superscript>) in charge-compensated sites of KPb<subscript>2</subscript>Cl<subscript>5</subscript>.
In: Journal of Applied Physics, Jg. 100 (2006-08-15), Heft 4, S. 43108-43113
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Zugriff:
A point-charge lattice-sum model corrected for induced multipoles is used to investigate the crystal-field splitting of the 2S+1 L J energy levels of Er 3+ (4f 11 ) ions that occupy charge-compensated sites in the laser host crystal KPb 2 Cl 5 . Spectroscopic data are reported and analyzed for Er 3+ between 1550 and 440 nm at cryogenic temperatures. The crystal-field (Stark) splitting of the ground-state manifold 4 I 15/2 and the splitting of individual excited manifolds of Er 3+ are established from analyses of temperature-dependent (hot band) absorption spectra. The analyses confirm the Stark splitting of the 4 I J and 4 F 9/2 manifolds that are reported in the literature. From an analysis of the data, it appears that only one of the two possible Pb 2+ sites serving as a charge-compensated site for Er 3+ is involved in the optical activity of the Er 3+ ions. From an examination of the crystallographic data of KPb 2 Cl 5 , we identify a possible site for the optically active Er 3+ ion in the lattice and calculate the lattice-sum components for that site. These components are used to evaluate the crystal-field splitting of the energy levels of Er 3+ at that site. The charge-compensation model assumes that Er 3+ substitutes for Pb 2+ in the Pb(2) site with a vacancy in a nearby K + site. To obtain the best overall agreement between calculated and experimental levels, the position of the Er 3+ ion is treated as an adjustable parameter along the quantization axis. Individual manifold centroids of the Er 3+ ion are also varied. From a least-squares fitting analysis, we obtain a rms deviation of 10 cm -1 between 48 calculated-to-observed Stark levels. [ABSTRACT FROM AUTHOR]
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Titel: |
Modeling the crystal-field splitting of energy levels of Er<superscript>3+</superscript>(4f<superscript>11</superscript>) in charge-compensated sites of KPb<subscript>2</subscript>Cl<subscript>5</subscript>.
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Autor/in / Beteiligte Person: | Gruber, John B. ; Yow, Raylon M. ; Nijjar, Anmol S. ; Russell, III., Charles C. ; Sardar, Dhiraj K. ; Zandi, Bahram ; Burger, Arnold ; Roy, Utpal N. |
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Zeitschrift: | Journal of Applied Physics, Jg. 100 (2006-08-15), Heft 4, S. 43108-43113 |
Veröffentlichung: | 2006 |
Medientyp: | academicJournal |
ISSN: | 0021-8979 (print) |
DOI: | 10.1063/1.2244416 |
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