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Dissociative electron attachment to DNA.

X Pan1, P Cloutier, D Hunting

  • 1Group of the Canadian Institutes of Health Research in the Radiation Sciences, Faculté de médecine, Université de Sherbrooke, Sherbrooke (QC) Canada J1H 5N4.

Physical Review Letters
|June 6, 2003
PubMed
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Investigating electron-stimulated desorption of anions from DNA films revealed resonant structures. These findings suggest that dissociative electron attachment is key to forming H-, O-, and OH- anions from DNA.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biophysics

Background:

  • DNA's interaction with electrons is crucial for understanding radiation damage.
  • Electron-stimulated desorption (ESD) is a surface-sensitive technique.
  • Anion desorption provides insights into molecular bond dissociation.

Purpose of the Study:

  • To investigate the desorption of anions from DNA thin films.
  • To determine the energy dependence of anion formation.
  • To elucidate the mechanisms of anion generation.

Main Methods:

  • Electron-stimulated desorption (ESD) experiments.
  • Thin films of linear and supercoiled DNA were used.
  • Incident electron energy ranged from 3 to 20 eV.

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Main Results:

  • Resonant structures were observed in the yield of H-, O-, and OH- anions.
  • Maxima for these anions were found at specific electron energies (9.4±0.3 eV for H-, 9.2±0.3 eV for O-, and 9.2±0.3 eV for OH-).
  • The observed resonances indicate specific electron-induced dissociation pathways.

Conclusions:

  • Dissociative electron attachment (DEA) is the primary mechanism for H-, O-, and OH- anion formation from DNA.
  • These findings contribute to understanding electron-DNA interactions at the molecular level.
  • The study highlights the sensitivity of anion desorption to DNA structure.