Measurement of Fe Temperature under Dynamic Compression

We report on progress toward measuring the temperature of Fe at ~2 Mbar, near the melting point on the Hugoniot, as part of an effort to obtain a complete equation of state for Fe. Fe was directly coated on a LiF tamping window and shock compressed using a two stage light gas gun. Radiance and reflectance were simultaneously measured from ~350-750 nm using four streak spectrometers. Comparison of reflected and emitted light allows us to calculate emissivity as a function of wavelength to correct graybody emission to determine T, predicted to be around 5000K, and compare measured reflectance with band structure calculations.