@article{oai:nagoya.repo.nii.ac.jp:00005452, author = {Takahashi, Kenshi and Taniguchi, Nori and Matsumi, Yutaka and Kawasaki, Masahiro and Ashfold, Michael N. R.}, issue = {17}, journal = {The Journal of Chemical Physics}, month = {May}, note = {O(^1D) and O(^3P_j) photofragments produced in the photodissociation of ozone in the wavelength range 305–329 nm both at 295 and 227 K have been detected directly using a technique of laser induced fluorescence (LIF) in the vacuum ultraviolet (vuv). Photofragment excitation (PHOFEX) spectra for both species have been measured by scanning the photodissociation laser wavelength whilst monitoring vuv-LIF at 115 nm [O(^1D)] and 130 nm [O(^3P_j)]. After applying suitable corrections for the relative detection sensitivities, suitably weighted combinations of these PHOFEX spectra were found to provide a quantitative match to the parent O_3 absorption spectrum both at 295 and 227 K, thereby providing a method of determining both the wavelength and temperature dependence of the absolute O(^1D) quantum yield, Φ_{1D}(λ,T). Hot band excitation of internally excited O_3 molecules and dissociation via the spin-allowed channel yielding O(^1D)+O_2(a^1Δg) products makes the dominant contribution to the quantum yield Φ_{1D}(λ T) in the wavelength range 310–320 nm. For λ>320 nm, however, both the Doppler profiles of the nascent O(^1D) atoms and the temperature dependence of the O(^1D) yield indicate that the O(^1D) atoms must arise predominantly via the spin-forbidden channel yielding O(^1D)+O_2(X^3∑_g^-). The analysis allows a first determination of the absolute branching to this channel (Φ~0.08) following O_3 photolysis in the wavelength range 318–329 nm. The present work highlights remaining deficiencies in the latest NASA/JPL recommendations regarding the wavelength and temperature dependence of the O(^1D) yield resulting from O_3 photolysis at λ>320 nm.}, pages = {7161--7172}, title = {Wavelength and temperature dependence of the absolute O(^1D) production yield from the 305–329 nm photodissociation of ozone}, volume = {108}, year = {1998} }