The dissociative photoionization of H_2O/D_2O between 20 and 40 eV

摘要

The appearance thresholds and kinetic energy spectra of fragment protons and deuterons produced in the dissociative photoionization of H_2O and D_2O by 20-40 eV photons have been measured. Measurements were made both along and at right angles to the E vector of the synchrotron radiation to isolate states of different symmetry. The results show the important role of superexcited states in the ionization process and predissociation and autoionization pathways have been identified.