Dissociative electron attachment to hydrated single DNA strands
Abstract
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- , O- , OH- from this target induced by 3-20eV electrons. Below 15eV , these anions emanate principally from a new type of dissociative core-excited transient anions formed via electron capture by a DNA- H2O complex. A smaller portion of the H- desorption signal arises from weakly bonded H2O molecules. The overall anion yield from DNA is increased by a factor of 1.6 owing to the presence of water.
- Publication:
-
Physical Review E
- Pub Date:
- March 2007
- DOI:
- 10.1103/PhysRevE.75.031915
- Bibcode:
- 2007PhRvE..75c1915P
- Keywords:
-
- 87.50.Gi;
- 34.80.Ht;
- 79.20.La;
- 87.14.-g;
- Ionizing radiations;
- Dissociation and dissociative attachment by electron impact;
- Photon- and electron-stimulated desorption;
- Biomolecules: types