Abstract
The three-particle interaction of protons in metallic hydrogen has been investigated in detail for the first time. It has been shown that this interaction is determined by the third-order perturbation-theory term in the potential of the electron-proton interaction for the energy of conduction electrons in the field of protons. It has been shown that the three-particle interaction for the majority of configurations of protons is small compared to the effective pairwise interaction, but for some configurations, it significantly exceeds the latter. It follows from the calculations performed that the three-particle interaction tends to compress hydrogen to larger densities than those produced by the pairwise effective interaction. The maximum depth of the potential well for the three-particle interaction of protons corresponds to the location of protons on a common straight line, which can be interpreted as a tendency to the formation of a cubic lattice in the metallic state. The liquid-metal state of hydrogen can be stable at temperatures that significantly exceed room temperature. The three-particle interaction also favors the transition of hydrogen into an atomic state as an intermediate state between its molecular and metallic phases.
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Original Russian Text © V.T. Shvets, 2015, published in Fizika Metallov i Metallovedenie, 2015, Vol. 116, No. 4, pp. 348–355.
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Shvets, V.T. Interaction of protons in metallic hydrogen. Phys. Metals Metallogr. 116, 328–335 (2015). https://doi.org/10.1134/S0031918X1502012X
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DOI: https://doi.org/10.1134/S0031918X1502012X