# Is there a phase diagram for $\rm CO_2$ below 1 millibar?

Considering $$\rm CO_2$$ snow on Mars and recent cold temperature on the earths' south pole, I am looking for a $$\rm CO_2$$ phase diagram below 1 millibar that shows the sublimation temperature of $$\rm CO_2$$ for $$\rm CO_2$$ partial pressure in earths atmosphere, (i.e. 0.4 millibar).

• Jun 24 at 6:51
• The lowest I found was 0.001 atm. That is why I asked. researchgate reference even stops at 0.01 atm. Jun 24 at 10:55
• @Farcher - indeed, the J. Phys. Chem. Ref. reference in one of the answers has the answer. A complicated answer, but the answer nonetheless. Jun 24 at 13:42
• Jon that reference is behind a paywal: so in theory, yes, a good answer, however, in practise it isn't if you just need a phase diagram and you are not affiliated to an institute with a journal subscription. Jun 25 at 4:42