Nucleation on Photoexcited Molecules

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Science  10 Jun 1977:
Vol. 196, Issue 4295, pp. 1203-1205
DOI: 10.1126/science.196.4295.1203


On irradiation with light of suitable wavelength and intensity, certain organic compounds, even at very low concentrations, cause very efficient nucleation of supersaturated vapors. A mechanism is suggested to account for this phenomenon. Nuclei containing only a few photoexcited molecules are responsible for the nucleation.