Hugoniot data for iron

A definitive set of the Los Alamos Hugoniot data for iron in a pressure regime extending to 442 GPa is given. Earlier standards data, obtained using conventional explosive systems, were thoroughly reprocessed. All original film records were reread. On the basis of more recent experiment and theory, some data were culled because the experimental designs were found to be insufficiently conservative. The analysis was also modified to take into account preheating of the explosively driven flyer plates. Minor clerical errors in transcription of measurements were corrected. An improved algorithm for the flash-gap time correction was incorporated. Higher-pressure data were obtained using a conventional 13-pin target assembly on a two-stage light gas gun. Several polynomial representations of the data are given. A linear fit to the data ${\mathrm{(U}}_s{\text{=3.935+1.578\hspace{0.05em}U}}_p,$ where the shock velocity $U_s$ and the particle velocity $U_p$ are in km/s) has a root-mean-square misfit of 62 m/s. The quadratic fit ${\mathrm{(U}}_s{\text{=3.691+1.788\hspace{0.05em}U}}_p{\text{−0.038\hspace{0.05em}U}}_p^2)$ has a root-mean-square misfit of 39 m/s.