Production of O(^1D) from photolysis of O_3
We have used a model accounting for absorption by vibrationally and rotationally excited ozone (O_3) to examine published measurements of the quantum yield of O(^¹D) and O_2(^¹Δ_g) from O_3 photolysis in the Huggins band (305–325 nm). We conclude that the quantum yield of O(^¹D) is 0.2–0.3 for wavelengths between 312 and 320 nm at 298 K; in contrast, the JPL recommended quantum yield of O(^¹D) is negligible in this wavelength region. We present a compilation of our results at temperatures and wavelengths relevant to atmospheric calculations. Production of O(^¹D) from excited O_3 increases calculated concentrations of O(^¹D) by up to 40% and OH by 15% for the troposphere and lower stratosphere.
© 1994 American Geophysical Union. Received March 30, 1994; last revised July 8, 1994; accepted July 27, 1994. Paper number 94GL02052. We thank the National Science Foundation for support of H. A. Michelsen through an NSF Postdoctoral Fellowship.
Published - grl7822.pdf