Fig. 2
From: Crystalline polymeric carbon dioxide stable at megabar pressures
Integrated X-ray diffraction patterns. The data are collected after the first (bottom) and second (top) cycle of laser heating, with the temperature quenched to 295 K between the two cycles (Black lines—experimental data, red lines—calculated profiles; difference line at the bottom). The calculated peak positions for the CO2-V phase and rhenium lines are displayed as tick marks. Additional weak features of intensities in the pattern (as indicated by the gray area) can be attributed to intracrystalline strain gradients and orientation-dependent lattice deformation of differently oriented crystal grains and completely disappear after the second cycle of heating. The corresponding 2D diffraction images are shown at the right (112 peak position indicated with green arcs)
