Laboratory evidence for a key intermediate in the Venus atmosphere: Peroxychloroformyl radical
For two decades, the peroxychloroformyl radical, ClC(O)OO, has played a central role in models of the chemical stability of the Venus atmosphere. No confirmation, however, has been possible in the absence of laboratory measurements for ClC(O)OO. We report the isolation of ClC(O)OO in a cryogenic matrix and its infrared and ultraviolet spectral signatures. These experiments show that ClC(O)OO is thermally and photolytically stable in the Venus atmosphere. These experimental discoveries validate the existence of ClC(O)OO, confirm several longstanding model assumptions, and provide a basis for the astronomical search for this important radical species.
Additional Information© 2004 by the National Academy of Sciences. Communicated by Richard M. Goody, Harvard University, Boston, MA, July 29, 2004 (received for review May 20, 2004). Published online before print September 16, 2004, 10.1073/pnas.0405501101 We thank M. F. Gerstell for a critical reading of the manuscript and W. DeMore, H. Hartman, C. Miller, C. Parkinson, V. Krasnopolsky, and the anonymous referees for useful comments. This research was supported partially by a Deutsche Forschungsgemeinschaft grant. This research was carried out in part at the Jet Propulsion Laboratory (California Institute of Technology) under contract to the National Aeronautics and Space Administration. J.S.F. expresses his thanks to the Alexander von Humboldt Foundation for a research grant for senior U.S. scientists.
Published - PERpnas04.pdf