Self-Diffusion in Krypton at Intermediate Density

The self-diffusion coefficient in Kr has been measured throughout a large range of densities ($0.35<\mathrm{}\rho <2\mathrm{}$ ${\mathrm{g}/\mathrm{c}\mathrm{m}}^3$) at temperatures near the critical one. The results are compared with molecular-dynamic calculations and with the C${\mathrm{H}}_4$ behavior. Although the qualitative agreement is good, disagreement from a quantitative point of view was found. The "normal behavior" of the self-diffusion coefficient in the critical region has been deduced.