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Pressure-induced transition from the dynamic to static Jahn-Teller effect in (Ph<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>P)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>IC<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>60</mml:mn></mml:msub></mml:math>
High-pressure infrared transmission measurements on (Ph${}_{4}$P)${}_{2}$IC${}_{60}$ were performed up to 9 GPa over a broad frequency range (200--20000 cm${}^{\ensuremath{-}1}$) to monitor the vibrational and electronic/vibronic excitations under pressure. The four fundamental ${T}_{1u}$ modes of C${}_{60}^{\ensuremath{-}}$ are split into doublets already at the lowest applied pressure and harden with increasing pressure. …