Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 19: Electronic Spectroscopy
MO 19.1: Hauptvortrag
Donnerstag, 26. März 2015, 14:30–15:00, PH/HS1
Luminescence properties of mass-selected lanthanoid complexes: a study involving gas-phase ion trapping, ion deposition into neon matrices, and computations. — •Jean-Francois Greisch1, Bastian Kern2, Michael E. Harding1, Jiří Chmela2, Bernhard Schäfer1, Artur Böttcher2, Wim Klopper1,2, Mario Ruben1,3, Detlef Schooss1,2, Dmitry Strelnikov2, Patrick Weis2, and Manfred M. Kappes1,2 — 1Inst. of Nanotechnology, KIT (D) — 2Inst. of Physical Chemistry, KIT (D) — 3Inst. de Physique et Chimie des Materiaux, CNRS-Uni. Strasbourg (F)
Charged lanthanoid-antenna complexes are relevant to many fields, e.g., photovoltaics, light-emitting diodes, and quantum memories. Investigation of their excited state properties directly benefits from mass spectrometric methods since their luminescence is strongly affected by stoichiometry, symmetry, and overall charge state. The talk focuses on a comparison between the luminescence properties of mass-selected ions (i) isolated in solid cryogenic neon matrices and (ii) in a Paul trap. For series of complexes having common stochiometry but varied lanthanoid composition we observe vibrationally-resolved ligand-centered or lanthanoid-centered emission. Energy level shifts and splittings are rationalized in terms of structural changes, which were analyzed with the support of ion mobility measurements. The role of the ligand shell and the induced ligand field on the lanthanoid's energy levels, as well as the differences in the vibrationally resolved spectra, are interpreted with the support of density functional theory combined with Judd-Ofelt theory and Franck-Condon computations, respectively.