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Abstract
Formation of C–C bonds was induced by femtosecond (fs) laser irradiation in CO2-saturated ultrapure water. In addition, fs-laser irradiation of aqueous HCOOH or (COOH)2 solution purged with CO2 or Ar generated larger molecules. Isotope experiments confirmed the certainty of the reactions. On the other hands, nanosecond (ns) laser irradiation produced CO only in ultrapure water, and fs-laser irradiation in gas-phase CO2 in the presence of water produced CO and H2 only. Discussion excluded possibility of direct interaction of laser light with CO2 molecules, ionization of molecules in water, and high temperature plasma formation. As a consequence, it is strongly suggested that formation of these organic molecules could be due to fs-laser induced shock wave exposure to CO2 molecules surrounded by water molecules.
Published Version
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