BioOne.org will be down briefly for maintenance on 17 December 2024 between 18:00-22:00 Pacific Time US. We apologize for any inconvenience.
How to translate text using browser tools
1 April 2001 Low-Energy (5–40 eV) Electron-Stimulated Desorption of Anions from Physisorbed DNA Bases
H. Abdoul-Carime, P. Cloutier, L. Sanche
Author Affiliations +
Abstract

Abdoul-Carime, H., Cloutier P. and Sanche, L. Low-Energy (5–40 eV) Electron-Stimulated Desorption of Anions from Physisorbed DNA Bases.

We present the results of experiments on anion desorption from the physisorbed DNA bases adenine, thymine, guanine and cytosine induced by the impact of low-energy (5–40 eV) electrons. Electron bombardment of DNA base films induces ring fragmentation and desorption of H, O, OH, CN, OCN and CH2 anions through either single or complex multibond dissociation. We designate the variation of the yield of an anion with electron energy as the yield function. Below 15 eV incident electron energy, bond cleavage is controlled mainly by dissociative electron attachment. Above 15 eV, the portion of a yield function that increases linearly is attributed to nonresonant processes, such as dipolar dissociation. A resonant structure is superimposed on this signal around 20 eV in the anion yield functions. This structure implicates dissociative electron attachment and/or resonant decay of the transient anion into the dipolar dissociation channel, with a minimal contribution from multiple inelastic electron scattering. The yields of all desorbing anions clearly show that electron resonances contribute to the damage of all DNA bases bombarded with 5–40 eV electrons. Comparison of the ion yields indicates that adenine is the least sensitive base to slow electron attack. Electron-irradiated guanine films exhibit the largest yields of desorbed anions.

H. Abdoul-Carime, P. Cloutier, and L. Sanche "Low-Energy (5–40 eV) Electron-Stimulated Desorption of Anions from Physisorbed DNA Bases," Radiation Research 155(4), 625-633, (1 April 2001). https://doi.org/10.1667/0033-7587(2001)155[0625:LEEESD]2.0.CO;2
Received: 1 August 2000; Accepted: 1 November 2000; Published: 1 April 2001
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top