An X-ray diffraction study of single-crystal CO2 has been undertaken at 1.00 (5) GPa pressure. The crystal exibits Pa3̄ symmetry with a cell edge of 5.4942 (2)° and C-O bond length, corrected for thermal motion effects, of 1.168 (1) Å. The study demonstrates that an earlier claim of a new dry ice II phase at this pressure is unfounded.
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Downs et al. (1998) studied this question.
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