| Zugriffsnummer | 15798 |
| Dokumenttyp | Bericht |
| Sprache | Englisch |
| Titel | Energy splitting of Yb2+ 5d states with different coordination polyhedra |
| Autor(in); Institution |
Henke, M.; Universität Hamburg, Institut für Laser-Physik, Hamburg, GERMANY
Rademaker, K.; Universität Hamburg, Institut für Laser-Physik, Hamburg, GERMANY
Kück, Stefan; 4.11, Radiometrische Einheiten, PTB-Braunschweig
|
| Quelle/Jahr | HASYLAB Annual Report:(2002) |
| Herausgeber(in) |
Krell, U.; Hamburger Synchrotronstrahlungslabor HASYLAB at DESY
|
| URL | |
| Verlag | Hamburg: Pepperzak Multimedia GmbH |
| Freie Schlagworte | Yb2+ ; 5d states ; synchrotron radiation |
| Zusammenfassung | The main topic of this work is the investigation of the interconfigurational transitions of divalent Ytterbium. These transitions between different electronic configurations are spectrally broad and can be electric dipole and spin allowed. The particular attention of this paper is on the interpretation of the observed excited energy levels and on the splitting mechanism. The ground state configuration of divalent Ytterbium is 4f14. The completely filled shell leads to a 1S0 ground state. In an octahedral crystal field this state transforms like a 1A1irreducible representation. The excited states have the configurations 4f135d or 4f136s. In order to vary the crystal field interaction two crystal groups are investigated for the interpretation of the excitation bands: hosts with sixfold lattice site coordination, i.e. LiCaAlF6, LiSrAlF6 and MgF2 and hosts with twelvefold lattice site coordination, i.e. LiBaF3 and KMgF3. All crystals were grown by the Czochralski method with automatic diameter control using RF-heated carbon crucibles. Single crystals were grown with a pulling rate of 1 mm/h in good optical quality with diameters up to 14 mm. All crystals contain divalent cation lattice sites, so a reducing atmosphere was sufficient to stabilize the divalent state of Yb. Because of the suitable ionic radius in KMgF3 the Yb ion occupies the potassium site and the charge compensation was supported by codoping with lithium. |
