Photoion-pair formation in H 2 O and D 2 O has been studied using synchrotron radiation within the energy range 15–50 eV. Appearance potentials for the formation of O − , OH − and H − have been determined and coincide with their thermochemical thresholds. Above threshold it is shown that superexcited states play an important role in the polar photodissociation process. Substantial isotope effects have been observed.
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Hunniford et al. (2007) studied this question.
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