Equation of State of CO_{2} Shock Compressed to 1 TPa.

Abstract

Equation-of-state (pressure, density, temperature, internal energy) and reflectivity measurements on shock-compressed CO_{2} at and above the insulating-to-conducting transition reveal new insight into the chemistry of simple molecular systems in the warm-dense-matter regime. CO_{2} samples were precompressed in diamond-anvil cells to tune the initial densities from 1.35  g/cm^{3} (liquid) to 1.74  g/cm^{3} (solid) at room temperature and were then shock compressed up to 1 TPa and 93 000 K. Variation in initial density was leveraged to infer thermodynamic derivatives including specific heat and Gruneisen coefficient, exposing a complex bonded and moderately ionized state at the most extreme conditions studied.

• Authors: L E Crandall, J R Rygg, D K Spaulding, T R Boehly, S Brygoo, P M Celliers, J H Eggert, D E Fratanduono, B J Henderson, M F Huff, R Jeanloz, A Lazicki, M C Marshall, D N Polsin, M Zaghoo, M Millot, G W Collins
• Journal: Physical review letters (Phys Rev Lett) Vol. 125 Issue 16 Pg. 165701 (Oct 16 2020) ISSN: 1079-7114 [Electronic] United States
• PMID: 33124844 (Publication Type: Journal Article)