Phys. Rev. Lett. 93, 043201 (2004) [4 pages]Regular Threshold-Energy Increase with Charge for Neutral-Particle Emission in Collisions of Electrons with Oligonucleotide AnionsReceived 9 July 2003; published 23 July 2004 Electron-DNA anion collisions were studied using an electrostatic storage ring with a merging electron-beam technique. The rate of neutral particles emitted in collisions started to increase from definite threshold energies, which increased regularly with ion charges in steps of about 10 eV. These threshold energies were almost independent of the length and sequence of DNA, but depended strongly on the ion charges. Neutral particles came from breaks of DNAs, rather than electron detachment. The step of the threshold energy increase approximately agreed with the plasmon excitation energy. It is deduced that plasmon excitation is closely related to the reaction mechanism. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.043201
DOI:
10.1103/PhysRevLett.93.043201
PACS:
34.80.Ht, 87.90.+y
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