Photofragment spectroscopy of ozone in the uv region 270–310 nm and at 600 nm

Abstract

Both O(3P) and O(1D) atom fragments are observed in the photofragment spectroscopy of O3 in the Hartley band absorption region 270–300 nm. The quantum yield for O(3P) is 0.1 at 274 nm. The dissociation partner for O(3P) is O2(X3Σ−g) and that for O(1D) is O2(a 1Δg). The O2(X 3Σ−g) fragment is populated in a range of vibrational levels, v?0−10. For the O2(a 1Δg) fragment, all energetically accessible vibrational levels are populated at each energy of bombardment. In the Chappuis bands at 600 nm the O2(X 3Σ−g) photofragment is produced principally with v=0, 1. Photofragment angular distributions are measured in the uv for both O atom dissociation products at each wavelength of bombardment. A theoretical angular distribution for O(1D) is derived and the resultant prediction is in good agreement with the experimental results.