Abstracts 2001

Abstract of Publication No. 412

Markus Wermuth, Christian Reber and Hans U. Güdel
High-Resolution Luminescence and Absorption Spectroscopy of Cs2GeF6:Os4+
Inorg. Chem. 40, 3693-3703 (2001)      Full Text (PDF)      DOI-Link     

Abstract: The luminescence spectrum of the Os4+ dopant ion occupying Oh sites of the Cs2GeF6 host shows three sets of resolved transitions in the near-infrared at approximately 12000, 9000, and 6700 cm1, corresponding to intraconfigurational transitions between the 1T2g lowest excited electronic state and the G1, G4, and G5/G3 spinor levels of the 3T1g ground state, respectively. The octahedral OsF62- chromophore does not emit from higher excited states, in contrast to related chloride and bromide host lattices, where several excited states show luminescence. The highly resolved single-crystal luminescence and absorption spectra are rationalized with ligand field parameters 10 Dq = 24570 cm1, B = 500 cm1, C = 2380 cm1, z = 3000 cm1. Transition intensities reveal an intermediate coupling situation for OsF62-: Whereas they generally follow the selection rules derived in the L-S coupling scheme, additional information can be gained from the j-j coupling limit. The resolved vibronic structure allows the identification of the most efficient ungerade parity enabling modes (vibronic origins) and shows that progressions along the a1g, eg, and t2g modes occur for some transitions.

Last modified: 13.12.11 by Gabriela Frei