Abstract
In this work we explored the competition between spin-orbit and Jahn-Teller effects as decisive influences in the ground states of the Td Au20 ±γ (γ=1,2,3). All our electronic calculations were based in the relativistic density functional theory in the zeroth-order regular approximation (ZORA) to the Dirac equation. Calculations were done in both versions of ZORA: scalar relativistic and full-relativistic including the spin-orbit interaction. We concluded that for the Au20 -3 ion is necessary to use a full-relativistic theory in order to predict a symmetry-lowering from tetrahedral. We predict a trigonal C3v isomeric form for this trianion due to a Jahn-Teller distortion of its parent Td. For the rest of ions we found a tendency to conserve their pristine tetrahedral configurations. In these cases we found one of both possibilities: a quenching of the vibronic interaction by spin-orbit coupling or simply a weak Jahn-Teller effect which is not enough to distort appreciably the cluster.
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Molina, B., Soto, J. & Calles, A. Competition between Jahn-Teller effect and spin-orbit coupling in Td Au20 ±γ, γ = 1,2,3. Eur. Phys. J. D 51, 225–231 (2009). https://doi.org/10.1140/epjd/e2009-00017-9
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DOI: https://doi.org/10.1140/epjd/e2009-00017-9