Figure from the DOE Report June, 2018

June 2018 DOE Report

Toward a Broadband Reflectivity Diagnostic on OMEGA EP

Measurements of optical reflectivity of compressed matter can be used to infer electrical and thermal conductivity, high-pressure insulator–conductor transitions, and benchmark electronic structure calculated by density functional theory. In this experiment, the reflectivity of aluminum, ramp compressed to 270 GPa (2.7 Mbar), was measured using a white-light (400- to 700-nm) probe in a reflective geometry. Aluminum exhibits strong absorption in the visible associated with splitting of parallel energy bands within its electronic structure. By examining the high-pressure optical response of aluminum, we attempt one of the first measurements of electronic structure in matter at extreme conditions.

Shown here: streak image and lineouts for OMEGA EP shot 28400.

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