Chiroptical activity of holmium pyrogermanate: tetragonal Ho2Ge2O7期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Chiroptical activity of holmium pyrogermanate: tetragonal Ho₂Ge₂O₇

Authors:	Diane M. Moran and F. S. Richardson M. Koralewski B. M. Wanklyn

Affiliation:	Chemistry Department, University of Virginia, Charlottesville, VA 22901, USA Institute of Physics, Adam Mickiewicz University, Poznan, Poland Clarendon Laboratory, University of Oxford, Oxford, UK

Abstract:	Chiroptical luminescence and circular dichroism measurements are reported for single crystals of Ho₂Ge₂O₇. These crystals belong to the tetragonal space group P4,2,2 (or P4₃2₁2) with Z=4. Each Ho³⁺ ion in the crystal structure is coordinated to seven oxygens to form a distorted pentagonal bipyramid. The Ho³⁺ ions exhibit luminescence from several excited multiplet levels; chiroptical luminescence spectra are reported for ⁶I₈ → ⁶F₆, ⁶S₂, and ⁶F₃ at a sample temperature of 10 K. Room-temperature absorption and circular dichroism measurements are reported for the ⁶I₈ → ⁶F₆, ⁵S₂, ⁶F₄, and ⁶F₃ transition regions.

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