Production of O(¹D) from photolysis of O3

Abstract

We have used a model accounting for absorption by vibrationally and rotationally excited ozone (O3) to examine published measurements of the quantum yield of O(¹D) and O2(¹Δg) from O3 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 O3 increases calculated concentrations of O(¹D) by up to 40% and OH by 15% for the troposphere and lower stratosphere. © 1994 by the Chinese Geophysical Society