Water Catalysis of a Radical-Molecule Gas-Phase Reaction

• DOI: 10.1126/science.1134494
• Publication Date: 2007-01-25T21:27:07Z
• Authors: E. Vöhringer-Mar...; B. Hansmann; H. Hernandez; J. S. Francisco; J. Troe; B. Abel
• Keywords: Reaction rate

There has been considerable speculation about the role of water and complexes in chemical gas-phase reactions, including conjecture that may act as a molecular catalyst through its ability to form hydrogen bonds. Here, we present kinetic studies which effect on rate reaction between hydroxyl radicals acetaldehyde measured directly Laval nozzle expansions at low temperatures. An increasing enhancement by added was found with decreasing temperatures 300 60 kelvin. Quantum calculations statistical theory support our conclusions this observation is due reduction an intrinsic barrier caused specific aggregation. The results suggest even single molecules can catalysts radical-molecule reactions.