Journal
PHYSICAL REVIEW A
Volume 73, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.73.040701
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- Engineering and Physical Sciences Research Council [GR/S56276/01] Funding Source: researchfish
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The electron impact dissociative double-ionization cross sections for H2O between 45 and 1500 eV have been measured using time of flight mass spectrometry. The energy dependence of the H++OH+ and H++O+ ion pair production cross sections indicate that Auger-like autoionization following a vacancy in the 2a(1) molecular orbital is the main double ionization channel at high velocities. In contrast to expectation, these findings show that dissociation through the H2O2+ precursor state is a significant process at high collision energies. Knowledge of this process is vital as it has a direct affect on the production of important molecular species, such as H-2, during water radiolysis. Branching ratios of the various fragments produced following both autoionization and double ionization have also been obtained.
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