Journal Article

Extended X-ray absorption fine structure of dynamically-compressed copper up to 1 terapascal

Efthimion, P. C., Schneider, M. B., Mackinnon, A., Le Galloudec, K., Hsing, W., McNaney, J. M., Hill, K. W., Sio, H., Eggert, J. H., Kemp, G., Ose, N., Park, H.-S., Bitter, M., Gao, L., Izumi, N., Rudd, R. E., Coppari, F., Vonhof, S., Fratanduono, D. E., Lockard, T. E., Krygier, A., Remington, B. A., Hood, R., Bonev, S. A., Bradley, D. K., Kozioziemski, B., Stoupin, S., Thorn, D. B., Bhandarkar, N., Wu, C. J., Ping, Y., Landen, O. L., Braun, D. G., Millot, M.

2023

Overview

Large laser facilities have recently enabled material characterization at the pressures of Earth and Super-Earth cores. However, the temperature of the compressed materials has been largely unknown, or solely relied on models and simulations, due to lack of diagnostics under these challenging conditions. Here, we report on temperature, density, pressure, and local structure of copper determined from extended x-ray absorption fine structure and velocimetry up to 1 Terapascal. These results nearly double the highest pressure at which extended x-ray absorption fine structure has been reported in any material. In this work, the copper temperature is unexpectedly found to be much higher than predicted when adjacent to diamond layer(s), demonstrating the important influence of the sample environment on the thermal state of materials; this effect may introduce additional temperature uncertainties in some previous experiments using diamond and provides new guidance for future experimental design. Dynamic compression experiments enable material studies in regimes relevant for planetary science, but temperature is difficult to measure in these challenging conditions. Here, the authors report on temperature, density, pressure, and structure of dynamically compressed Cu up to 1 TPa determined from extended x-ray absorption fine structure and velocimetry.

• Publisher: Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
• Subject: 639/301/119/1002 / 639/766/119/1002 / 639/766/119/2795 / 70 PLASMA PHYSICS AND FUSION TECHNOLOGY / Absorption / Copper / Density / Design of experiments / Diamonds / Fine structure / Humanities and Social Sciences / multidisciplinary / Science / Science (multidisciplinary) / Thrombolytic drugs / Ultrastructure / Velocimetry / X ray absorption