Dissociative electron attachment to hydrated single DNA strands

Journal Article · Thu Mar 15 00:00:00 EDT 2007 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

DOI:https://doi.org/10.1103/PHYSREVE.75.031915· OSTI ID:21072400

Ptasinska, Sylwia; Sanche, Leon ^[1]

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1. Group in the Radiation Sciences, Department of Nuclear Medicine and Radiobiology, Faculty of Medicine, Universite de Sherbrooke, Sherbrooke, Quebec, J1H 5N4 (Canada)

The present experiments concern electron interactions with a film of short single strands of DNA covered by 3 monolayers of water, which corresponds to 5.25 water molecules per nucleotide. We report on the desorption of H{sup -}, O{sup -}, OH{sup -} from this target induced by 3-20 eV electrons. Below 15 eV, these anions emanate principally from a new type of dissociative core-excited transient anions formed via electron capture by a DNA-H{sub 2}O complex. A smaller portion of the H{sup -} desorption signal arises from weakly bonded H{sub 2}O molecules. The overall anion yield from DNA is increased by a factor of 1.6 owing to the presence of water.

• OSTI ID: 21072400
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Vol. 75, Issue 3; Other Information: DOI: 10.1103/PhysRevE.75.031915; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
DESORPTION
DISSOCIATION
DNA
ELECTRON ATTACHMENT
ELECTRON CAPTURE
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
EV RANGE
FILMS
HYDROGEN IONS 1 MINUS
HYDROXYL RADICALS
MOLECULES
NUCLEOTIDES
OXYGEN IONS
TRANSIENTS
WATER