We find that both approaches provide similar results, with the 1 O loss channels requiring approximately 5.29-5.47 eV of energy and the 3 O loss channels only requiring 3.43-4.39 eV of energy to facilitate O loss. At the photon energies in this experiment of 3.65-4.27 eV (290-340 nm), these calculations suggest that it is energetically impossible to access the 1 O + 1 (cluster). Therefore, we assign photolysis of these clusters to a mechanism resulting in production of an O fragment and a 3 (cluster).