Phys. Rev. Lett. 77, 3983–3986 (1996)Observation of Negative Ion Resonances in Amorphous Ice via Low-Energy (5–40 eV) Electron-Stimulated Production of Molecular HydrogenReceived 29 April 1996; published in the issue dated 4 November 1996 The D2(1Σg+, v = 0–2, J = 0–2) desorbates produced during low-energy (5–40 eV) electron-beam irradiation of amorphous D2O ice were monitored using resonance-enhanced laser ionization spectroscopy. We attribute the structure in the D2 yield as a function of the incident electron energy to core-excited negative ion resonances. These resonances, or the excited states produced after electron autodetachment, decay via molecular elimination to yield D2(1Σg+) directly. D2 is observed with v = 0 or 2 but not v = 1, suggesting a symmetry propensity in the excitation or decay of the resonances. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.3983
DOI:
10.1103/PhysRevLett.77.3983
PACS:
33.80.Rv, 34.80.Gs, 79.20.Kz
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