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Many-atom screening effects on diffusion in dense helium.

The structure and dynamics of helium at 5 eV over the density range 1.5{le}{rho}{le}8 g/cm{sup 3} were studied using self-consistent-field molecular dynamics. Representative results for the pair-correlation function, velocity autocorrelation function, and the average charge density surrounding an atom are presented. Many-atom screening is found to have an important effect on all of these quantities above 0.3 g/cm{sup 3}. Above 2 g/cm{sup 3}, screening effects appear to saturate, and the coefficient of diffusion tends to the limit of a one-component plasma.