High-Precision Equation Of State Benchmark For Cryogenic Liquid Deuterium At Ultrahigh Pressure

We provide a principal Hugoniot of cryogenic liquid deuterium at a pressure of 27 < P < 240 GPa, with reflected-shock data of up to similar to 830 GPa. The maximum density reaches similar to 1.49 g/cm(3), about 8.7 times the initial density. Our independent principal Hugoniot experimental data broadly support the wide-regime equation of state (WEOS) model, which well matches Fernandez-Panella et al. [Phys. Rev. Lelt. 122, 255702 (2019)] and Knudson et al. [Phys. Rev. Lett. 118, 035501 (2017)] experimental data over the observed pressure range up to 550 GPa, and most of three sets of reflected shock data are in accordance with our theory up to 1 TPa. Our high-precision experimental results establish an important benchmark equation of state of deuterium and conform to the WEOS model quite well. Our work is useful for the development of the high-pressure response of hydrogen's isotopes, directly related to inertial confinement fusion, planetary science, and metallization.