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A sound reaction: The ultrasonically driven disproportionation of CO in water causes formation of hydrated polymer of carbon suboxide (C3O2)n (see picture) enriched with a heavy 13C isotope. This finding indicates the presence of vibrationally excited CO molecules with a non-equilibrium Treanor distribution inside the cavitating bubble.
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Nikitenko et al. (2009) studied this question.
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