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Science 20 November 1992:
Vol. 258. no. 5086, pp. 1342 - 1345
DOI: 10.1126/science.258.5086.1342
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Articles

Direct Observation of CIO from Chlorine Nitrate Photolysis

Timothy K. Minton 1, Christine M. Nelson 2, Teresa A. Moore 2, and Mitchio Okumura 2

1 Jet Propulsion Laboratory, Mail Stop 67-201, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109
2 Arthur Amos Noyes Laboratory of Chemical Physics, Mail Stop 127-72, California Institute of Technology, Pasadena, CA 91125

Chlorine nitrate photolysis has been investigated with the use of a molecular beam technique. Excitation at both 248 and 193 nanometers led to photodissociation by two pathways, CIONO2 rarr CIO + NO2 and CIONO2 rarr Cl + NO3, with comparable yields. This experiment provides a direct measurement of the CIO product channel and consequently raises the possibility of an analogous channel in CIO dimer photolysis. Photodissociation of the CIO dimer is a critical step in the catalytic cycle that is presumed to dominate polar stratospheric ozone destruction. A substantial yield of CIO would reduce the efficiency of this cycle.

Submitted on July 6, 1992
Accepted on October 5, 1992


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Removal of Stratospheric O3 by Radicals: In Situ Measurements of OH, HO2, NO, NO2, ClO, and BrO.
P. O. Wennberg, R. C. Cohen, R. M. Stimpfle, J. P. Koplow, J. G. Anderson, R. J. Salawitch, D. W. Fahey, E. L. Woodbridge, E. R. Keim, R. S. Gao, et al. (1994)
Science 266, 398-404
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