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Americium occupies a pivotal position in the actinide series with regard to the behavior of 5f electrons. High-pressure techniques together with synchrotron radiation have been used to determine the structural behavior up to 100 GPa. We have resolved earlier controversial findings regarding americium and find that our experimental results are in discord with recent theoretical predictions. We have two new findings: (1) that there exists a critical, new structural link between americium under pressure and its near neighbour, plutonium: and (2) that the 5f electron delocalisation in americium occurs in two rather than one step.

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Authors: HEATHMAN S, Institute Transuranium Elements, Karlsruhe, (DE);LINDBAUM A, Institute Transuranium Elements, Karlsruhe, (DE);LITFIN K, Institute Transuranium Elements, Karlsruhe, (DE);MERESSE Y, Institute Transuranium Elements, Karlsruhe, (DE);HAIRE R.G, Oak Ridge National Laboratory, Tennessee, (US);LE BIHAN T, European Synchrotron Radiation Facility, Grenoble (FR);LIBOTTE H, European Synchrotron Radiation Facility, Grenoble (FR)
Bibliographic Reference: ART: 90250. Physical review letters, Vol 85, No 14, 2 October (2000)pp. 2961-2964
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