We present results of studies on shock-induced shifts in the K-photoabsorption edge of aluminum. Time-resolved x-ray spectroscopic measurements indicated maximum red shifts of ∼7 eV for compressions of ∼2.2 times normal density. The results are interpreted using hydrodynamic simulations which incorporated a new model for calculating the K-edge energy in a dense plasma.

• Received 25 July 1988

DOI:https://doi.org/10.1103/PhysRevLett.62.1623