Photodissociation Processes of Ozone in the Huggins Band at 308−326 nm: Direct Observation of O(1D2) and O(3Pj) Products

Abstract

Both O(1D) and O(3Pj) atoms produced in the photodissociation of O3 were directly detected, using a vacuum ultraviolet laser-induced fluorescence technique. The photofragment yield spectra of the O(1D) and O(3Pj) atoms were recorded at 298 K, scanning the photodissociation laser wavelength across the range 308−326 nm in the Huggins band system of O3. The photofragment yield spectrum for O(3Pj) has the vibrational structure as appearing in the absorption spectrum in the Huggins band, while the spectrum for O(1D) is smooth and has no structure. The wavelength dependence of the quantum yield for O(1D) from the O3 photolysis exhibits a dip at every peak of the vibrational structure in the absorption spectrum in the Huggins band. The partial cross sections for the O(1D) production process in the photoabsorption of O3 were determined. The existence of the tail around 315 nm in the wavelength dependence of the quantum yield of O(1D) produced from O3 photolysis was verified. Our results indicate that the tail ari...