Laser photodissociation of O3+ and the energetics of ozone and its ions

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Abstract
Absolute cross sections for the production of O+ from O+3 have been determined at intervals of 1 nm or less through the range from 560 to 730 nm. The results are interpreted as implying an upper limit on the threshold for this process of 1.860±0.005 eV. This value, together with recent values for the adiabatic ionization potential of ozone, implies an upper limit for the bond dissociation energy of neutral ozone of 0.761±0.007 eV. This bond dissociation energy is in excellent agreement with our earlier result derived from photodissociation measurements on O3− but in serious disagreement with the literature value of 1.05±0.02 eV determined calorimetrically.