Volume 126, Number 5, June 2019
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||04 July 2019|
Theoretical and experimental refraction index of shock compressed and pre-compressed water in the megabar pressure range
1 IPPLM - 01-497 Warsaw, Poland
2 Université Bordeaux, CNRS, CEA, CELIA, UMR 5107 - F-33405 Talence, France
3 CEA, DAM, DIF - F-91297 Arpajon, France
Received: 13 February 2019
Accepted: 7 June 2019
The refraction index of water at megabar pressures was calculated ab initio with the quantum molecular dynamics (QMD) package ABINIT using the projector augmented (PAW) formalism. Calculations were compared to experimental results obtained by laser-driven shocks on water in standard conditions and on water samples statically precompressed at . The refraction index was measured in transparent and opaque states of water using a VISAR diagnostics. We also modelled the data using an extended Lorentz-Drude model. At high compressions, a strong increase of the refraction index is observed both in experimental results and in the theoretical calculations, which is an indication of water approaching band gap closure.
PACS: 64.30.-t – Equations of state of specific substances / 52.38.-r – Laser-plasma interactions / 62.50.-p – High-pressure effects in solids and liquids
© EPLA, 2019
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