Journal of Physical Chemistry, Vol.100, No.10, 4084-4089, 1996
Photodissociation Processes of Ozone in the Huggins Band at 308-326 nm - Direct Observation of O(D-1(2)) and O(P-3(J)) Products
Both O(D-1) and O(P-3(j)) atoms produced in the photodissociation of O-3 were directly detected, using a vacuum ultraviolet laser-induced fluorescence technique. The photofragment yield spectra of the O(D-1) and O(P-3(j)) atoms were recorded at 298 K, scanning the photodissociation laser wavelength across the range 308-326 nm in the Huggins band system of O-3. The photofragment yield spectrum for O(P-3(j)) has the vibrational structure as appearing in the absorption spectrum in the Huggins band, while the spectrum for O(D-1) is smooth and has no structure. The wavelength dependence of the quantum yield for O(D-1) from the O-3 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(D-1) production process in the photoabsorption of O-3 were determined. The existence of the tail around 315 nm in the wavelength dependence of the quantum yield of O(D-1) produced from O-3 photolysis was verified. Our results indicate that the tail arises predominantly from the hot-band excitation of O-3.
Keywords:ABSORPTION CROSS-SECTION;LASER FLASH-PHOTOLYSIS;WAVELENGTH RANGE;QUANTUM YIELDS;SPECTROSCOPY;FREQUENCY;KRYPTON