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Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>A</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn>60</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">K</mml:mi><mml:mo…
We report the temperature dependent mid- and near-infrared spectra of ${\mathrm{K}}_{4}{\mathrm{C}}_{60}$, ${\mathrm{Rb}}_{4}{\mathrm{C}}_{60}$, and ${\mathrm{Cs}}_{4}{\mathrm{C}}_{60}$. The splitting of the vibrational and electronic transitions indicates a molecular symmetry change of ${\mathrm{C}}_{60}^{4\ensuremath{-}}$ which brings the fulleride anion from ${D}_{2h}$ to either a ${D}_{3d}$ or a ${D}_{5d}$ distortion. In contrast to ${\mathrm{Cs}}_{4}{\mathrm{C}}_{60}$, low temperature …