Physics – Condensed Matter
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..shk.l3002c&link_type=abstract
American Physical Society, 14th APS Topical Conference on Shock Compression of Condensed Matter, July 31-August 5, 2005, abstrac
Physics
Condensed Matter
Scientific paper
The equation of state and opacity of warm dense helium (1 < ρ< 10 g/cm^3, 0.5 < T < 5 eV) is essential for addressing a variety of astrophysical problems. High-pressure experimental data on dense helium are sparse; models used by the astrophysical community have been calibrated against a small number of gas-gun measurements much below 1 g/cm^3. Using coupled static- and dynamic-compression techniques it is becoming feasible to recreate the conditions of giant planetary interiors in laboratory; in recent experiments we have compressed helium to over 1.2 g/cm^3. We present measurements of pressure, temperature, density, and reflectivity of compressed helium using quartz as a reference material for impedance matching. Reflectivity data at these conditions show that helium is not a clear dielectric fluid but reflects like a metal. The pressure for this transition is almost independent of temperature, as would be expected for pressure-induced ionization, but it occurs at pressures 1-2 orders of magnitude lower than theoretically expected for the T = 0 K solid or fluid.
Boehly Tom R.
Celliers Peter M.
Collins George W.
Hicks Damien G.
Jeanloz Raymond
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