Spectroscopic experiment reveals short-range repulsive interactions shape ion structure in warm dense beryllium, indicating standard Coulomb models fail under extreme conditions.
Isochorically heated beryllium samples were investigated using collective spectrally resolved X‐ray Thomson scattering with titanium He‐ and Ly‐ emission at energies of 4.75 and 4.977 keV. Based on radiation hydrodynamics simulations and theoretical fits to the scattering spectra, the beryllium plasma conditions—including temperature, ionization state, and the ion static structure factor at a scattering angle of 23°—were determined. It is found that theoretical models employing an unscreened Coulomb potential or a screened Coulomb ion‐ion potential fail to reproduce the ion structure of warm dense beryllium plasmas; only the model incorporating an additional short‐range repulsive interaction shows good agreement with the experimental data.
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Lv et al. (2026) studied this question.
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