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Microscopic roots of alcohol-ketone demixing: infrared spectroscopy of methanol-acetone clusters.

Infrared spectra of isolated methanol-acetone clusters up to tetramers are experimentally characterized for the first time. They show evidence for a nanometer-scale demixing trend of the cold species. In combination with quantum calculations, the mutual repulsion is demonstrated to start beyond three molecular units, whereas individual molecules still prefer to form a mixed complex.