Dynamic structure of dense krypton gas

We have made molecular-dynamics computer simulations of dense krypton gas ($10.6\times {10}^{27}$ atoms/${\mathrm{m}}^3$ and 296 K) using reasonably realistic pair potentials. Comparisons are made with the recent experimental data[P. A. Egelstaff et al., Phys. Rev. A 27, 1106 (1983)] for the dynamic structure factor $S(q,\omega )$ over the range $0.4<q<\mathrm{}3.0\mathrm{}$ ${\mathrm{\AA }}^{-1\mathrm{}}$. For $q<\mathrm{}1.6\mathrm{}$ ${\mathrm{\AA }}^{-1\mathrm{}}$ the influence of the attractive part of the potential is important and shorter-ranged many-body forces are found to play a role. Additional (less significant on a relative scale) effects are found in the region $q~2.7\mathrm{}$ ${\mathrm{\AA }}^{-1\mathrm{}}$. Some suggestions for future work are made.