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Electron spectroscopy in proton collisions with dry gas phase uracil base

We have investigated the electron emission by the RNA uracil base (C4H4N2O2) due to collisions with protons in the 25 keV–100 keV energy range. Electron spectroscopy was performed at 35° with respect to the beam direction and absolute values for the double-differential cross section were obtained. Our results show preferential emission of low-energy electrons that are responsible for damage in biological material through dissociative electron attachment [Boudaïffa et al., Science 287, 1658 (2000)]. Experimental results are compared to calculations that used the classical trajectory Monte Carlo method, and a reasonable agreement is obtained.


Voir en ligne : Phys.Rev.A 74, 062705 (2006) et Virtual Journal of Biological Physics Research 12 (2006)