Extending of Carbon Dioxide phase diagram for multi megabar pressure range

Carbon dioxide (CO2) was widely studied during the last years and despite its simple molecular form at ambient conditions, up to seven crystalline polymorphs of CO2 were reported experimentally, in addition to an amorphous form. Despite its terrestrial abundance and astrochemical significance, carbon dioxide was studied only up to pressures 120 GPa and its behaviour at higher pressures remains unclear. Here, we propose to in-situ single crystal x-ray diffraction study of CO2 at multi megabar pressure in diamond anvil cells. The samples of solid carbon dioxide will be studied after in house laser heating in temperature range up to 5000K and pressures 100-250 GPa and therefore we would like to establish its phase diagram and reveal new possible phases what are in great interest for chemical and geophysical science.