Abstract
For the first time, an ab initio nonlocal pseudopotential of the electron–ion interaction for metallic helium is proposed. With its help, a pairwise effective interionic interaction in the case of singly ionized helium atoms is found in a wide range of densities. The calculation results are compared with the results given by simpler models of metallic helium, as well as for metallic hydrogen. The use of the proposed pseudopotential allows one to conclude that metallic helium can exist in a stable state at relatively high temperatures in a wide range of densities. Such conclusions are fundamentally related to the effect of orthogonality of the wave functions of conduction electrons and the wave functions of bound electrons of helium ions, which are taken into account when constructing the pseudopotential from first principles.
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Translated by E. Chernokozhin
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Shvets, V.T. Ab initio Pseudopotential and Interionic Interaction in Metallic Helium. Phys. Metals Metallogr. 122, 950–953 (2021). https://doi.org/10.1134/S0031918X21100112
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DOI: https://doi.org/10.1134/S0031918X21100112