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Against all odds: Carbonic acid molecules were trapped from the gas phase in a solid noble-gas matrix at <10 K and studied by IR spectroscopy. The 2H and and 13C isotopologues were also examined. Gas-phase carbonic acid is thought to exist as a 1:10:1 mixture of two monomeric conformers and the cyclic dimer (H2CO3)2. This data is vital in the search for gas-phase carbonic acid in astrophysical environments.
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Bernard et al. (2010) studied this question.
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