Comment on “High-Pressure Melting Curve of Nitrogen and the Liquid-Liquid Phase Transition”

A Comment on the Letter by Goutam Dev Mukherjee and Reinhard Boehler, [Phys. Rev. Lett. 99, 225701 (2007)]. The authors of the Letter offer a Reply.

Figure 1

(a) The extrapolation of the melting curve from 8 with Simon (circles) and Kechin (triangles) laws. The filled diamonds are points from 1. The points with error bars are from Ref. 7. The kinetic boundary separating the $ϵ(\zeta )\mathrm{\text{−}}{\mathrm{N}}_2$ from the $\iota (\theta )\mathrm{\text{−}}{\mathrm{N}}_2$ and nonmolecular ($\eta$) nitrogen is around the filled circles [4]. (b) The Raman spectra of $ϵ$ (before) and $\iota \mathrm{\text{−}}{\mathrm{N}}_2$ (after) the laser heating at 48 GPa.