Figure 6
From: Interferometric measurements of refractive index and dispersion at high pressure
(a) Refractive index of \(H_{2}O\) in liquid and ice VI phases measured at 532 nm in this study with literature values12,13,14,17,18,19,20,39. Our dataset is fitted with power-law12 and Murnaghan-type19 models (red solid and blue dashed lines) and the fitting curves are extrapolated to 0 and 2.4 GPa (thin red and blue dash-dotted lines). Equilibrium pressure levels for water-to-ice VI and ice VI-to-ice VII transitions (0.96 and 2.15 GPa at \(25\,^\circ \hbox {C}\)40) are indicated with black dotted vertical lines. Error for pressure is 0.03 GPa. Random and systematic errors for the index are 10\(^{-4}\) and 5 \(\times\) 10\(^{-4}\), respectively. (b,c) The differences of our data from the power-law fitting curve (red square), the recalculated index using another correction relation for the image aberration \(r'_{ab}\) (see section “Image aberration”, blue circle), and the literature result12 (green triangle).
