Low-energy (5--120 eV) electron-stimulated dissociation of amorphous D{sub 2}O ice: D({sup 2}{ital S}), O({sup 3}{ital P}{sub 2,1,0}), and O({sup 1}{ital D}{sub 2}) yields and velocity distributions

Journal Article · Mon Sep 25 04:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.2606· OSTI ID:241402

Kimmel, G A; Orlando, T M ^[1]

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1. Environmental Molecular Sciences Laboratory, Pacific Northwest Laboratory, Richland, Washington 99352 (United States)

Laser resonance enhanced multiphonon ionization spectroscopy was used to measure yields and velocity distributions of the D({sup 2}{ital S}), O({sup 3}{ital P}{sub 2,1,0}), and O({sup 1}{ital D}{sub 2}) produced during low-energy (5--120 eV) electron-beam irradiation of amorphous D{sub 2}O ice. Electron-stimulated dissociation has a very low energy threshold ({similar_to}6--7 eV), and the neutral fragments desorb with low kinetic energies ({similar_to}60--85 meV) which are {ital independent} of the incident electron energy. The data suggest that desorption of neutral fragments results from dissociation of excited states formed directly or via electron-ion recombination.

• Research Organization: Pacific Northwest National Laboratory
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 241402
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 75; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
AMORPHOUS STATE
DESORPTION
DEUTERIUM COMPOUNDS
DISSOCIATION
ELECTRON BEAMS
EV RANGE
ICE
OXIDES
YIELDS