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Iodine molecule modifications with high pressure

Authors: J. Shi, S. Botti, M.A.L. Marques, T. Shinmei, T. Irifune, E. Fonda, A.-M. Flank, P. Lagarde, O. Mathon, V. Pischedda, A. Polian, J.-P. Itié, and A. San-Miguel

Ref.: submitted (2020)

Abstract: We explored the iodine-iodine intramolecular evolution in iodine crystals under high pressure using X-ray absorption spectroscopy and atomistic modeling. Both methods show that with increasing pressure, the iodine diatomic molecule elongates up to a critical pressure Pc ~7 GPa and then contracts with a lower rate. Experiments show that the iodine-iodine intramolecular distance increases by 0.03 Å up to Pc and then decreases to reach again the initial ambient pressure value at about 20 GPa. The observed change rate of the iodine-iodine bond length with pressure corresponds to the one already observed in bromine. Universal trends in halogens under increasing density are discussed allowing to predict for chlorine a critical pressure of 50+/-5 GPa for molecular bond-length reversal.

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