Affiliation:
1. 1Institut für Physikalische und Theoretische Chemie, Universität Regensburg, D-8400 Regensburg
Abstract
The optical absorption of (NH4)2TeCl6 in acetonitrile at room temperature and the luminescence (spectra, decay curves) of single crystal (NH4)2TeCl6 at 1.9 K ≤ T ≤ 180K and at applied magnetic fields H (0 ≤ H ≤ 6 T) are reported. The temperature dependence of the luminescence indicates the existence of a metastable excited state energetically by ~ 80 cm−1 below a second excited state. With H || <111> the decay curves are monoexponential with magnetic field dependent slopes. H ||<001> yields biexponential decay curves, each composed of a slow component corresponding to the decay at H = 0, and of a field dependent fast component. The experimental results can be explained by effects of a tetragonal Jahn-Teller distortion due to a strong coupling of the excited electronic state 3Tlu of the Te(IV) ions and Eg vibration modes.
Subject
Physical and Theoretical Chemistry,General Physics and Astronomy,Mathematical Physics
Cited by
12 articles.
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