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Bond- and site-selective loss of H- from pyrimidine bases

Ptasinska, Sylwia; Denifl, Stephan; Grill, Verena; Märk, Tilmann D.; Illenberger, Eugen and Scheier, Paul. (2005). Bond- and site-selective loss of H- from pyrimidine bases. Physical Review Letters, 95(9) 093201-1-093201-4.

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Electron attachment to gas phase thymine and uracil leads to H- loss within a broad and structured feature in the energy range between about 5 and 12 eV consisting of 4 overlapping resonances. By using thymine and uracil methylated at the N1 and N3 positions, respectively, and taking into account recent results from partly deuterated thymine, we find that by tuning the electron energy, H- loss turns out to be not only bond selective, i.e., (C-H) versus (N-H) bonds, but also site selective (N1 versus N3 site). Such a bond and site selectivity by energy has not been observed before in dissociative electron attachment. Implications for the mechanism of strand breaks observed in plasmid DNA are considered.

Item Type: Journal Article
ISSN: 1079-7114
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 9919
Depositing User: Users 2315 not found.
Date Deposited: 25 Oct 2007
Last Modified: 14 Jan 2016 16:49
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