Shock Compression of Liquid Deuterium up to 1 TPa.

Abstract

We present laser-driven shock compression experiments on cryogenic liquid deuterium to 550 GPa along the principal Hugoniot and reflected-shock data up to 1 TPa. High-precision interferometric Doppler velocimetry and impedance-matching analysis were used to determine the compression accurately enough to reveal a significant difference as compared to state-of-the-art ab initio calculations and thus, no single equation of state model fully matches the principal Hugoniot of deuterium over the observed pressure range. In the molecular-to-atomic transition pressure range, models based on density functional theory calculations predict the maximum compression accurately. However, beyond 250 GPa along the principal Hugoniot, first-principles models exhibit a stiffer response than the experimental data. Similarly, above 500 GPa the reflected shock data show 5%-7% higher compression than predicted by all current models.

• Authors: A Fernandez-Pañella, M Millot, D E Fratanduono, M P Desjarlais, S Hamel, M C Marshall, D J Erskine, P A Sterne, S Haan, T R Boehly, G W Collins, J H Eggert, P M Celliers
• Journal: Physical review letters (Phys Rev Lett) Vol. 122 Issue 25 Pg. 255702 (Jun 28 2019) ISSN: 1079-7114 [Electronic] United States
• PMID: 31347873 (Publication Type: Journal Article)