<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>H</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Desorption from Uracil via Metastable Electron Capture

Grandi, A.; Gianturco, F. A.; Sanna, Nico

doi:10.1103/physrevlett.93.048103

Cited by 38 publications

(24 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition to the poor characterization of the possible higher-lying resonances in pyrimidine DNA bases, previous studies [18][19][20][22][23][24][25] have struggled to produce parameters of, especially, the third (highest-lying) π * resonance in satisfactory agreement with experimental values. For this reason, Winstead and McKoy investigated elastic electron collisions with a model molecule, pyrazine.…”

Section: The Calculations Of Winstead and Mckoy Found Evidence Forsupporting

confidence: 65%

Elastic and inelastic low-energy electron collisions with pyrazine

Mašín

Gorfinkiel

2011

The Journal of Chemical Physics

View full text Add to dashboard Cite

We present results of ab-initio scattering calculations for electron collisions with pyrazine using the R-matrix method, carried out at various levels of approximation. We confirm the existing experimental and theoretical understanding of the three well-known π * shape resonances. In addition, we find numerous core-excited resonances (above 4.8 eV) and identify their most likely parent states. We also present differential cross sections, showing high sensitivity to the scattering model chosen at low energies. We make recommendations regarding the selection of models for scattering calculations with this type of targets.

show abstract

Section: The Calculations Of Winstead and Mckoy Found Evidence Forsupporting

confidence: 65%

Elastic and inelastic low-energy electron collisions with pyrazine

Mašín

Gorfinkiel

2011

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…First, for shape resonances the lifetime is usually too short above 5 eV for dissociation [16,24] and electron detachment or transfer is highly probable. Second, Grandi et al [25] have reported the formation of a shape resonance for uracil near 9 eV. Consequently, this transient anionic state, which should also exist for nucleobases bound in DNA, could transfer its excess electron to unfilled orbitals of the phosphate group, lying close to 9 eV.…”

Section: Dna Damage Induced By Low Energy Electronsmentioning

confidence: 99%

Stable Valence Anions of Nucleic Acid Bases and DNA Strand Breaks Induced by Low Energy Electrons

Rak

Mazurkiewicz

Kobyłecka

et al. 2008

Challenges and Advances in Computational Chemistry and Physics

View full text Add to dashboard Cite

Abstract:The last decade has witnessed immense advances in our understanding of the effects of ionizing radiation on biological systems. As the genetic information carrier in biological systems, DNA is the most important species which is prone to damage by high energy photons. Ionizing radiations destroy DNA indirectly by forming low energy electrons (LEEs) as secondary products of the interaction between ionizing radiation and water. An understanding of the mechanism that leads to the formation of single and double strand breaks may be important in guiding the further development of anticancer radiation therapy. In this article we demonstrate the likely involvement of stable nucleobases anions in the formation of DNA strand breaks -a concept which the radiation research community has not focused on so far. In Section 21.1 we discuss the current status of studies related to the interaction between DNA and LEEs. The next section is devoted to the description of proton transfer induced by electron attachment to the complexes between nucleobases and various proton donorsa process leading to the strong stabilization of nucleobases anions. Then, we review our results concerning the anionic binary complexes of nucleobases with particular emphasize on the GC and AT systems. Next, the possible consequences of interactions between DNA and proteins in the context of electron attachment are briefly discussed. Further, we focus on existing proposal of single strand break formation in DNA. Ultimately, open questions as well perspectives of studies on electron induced DNA damage are discussed

show abstract

“…Gianturco and Lucchese 28 reported ‫ء‬ and ‫ء‬ shape-resonance energies determined from a scattering calculation; however, Burrow has questioned 29 the correctness of these results on both experimental and theoretical grounds. Grandi and co-workers 30 also reported a study of uracil at higher collision energies, ϳ9 eV, using a similar approach to that of Gianturco and Lucchese but with the further approximation of imposing D 2h symmetry on the scattering electron's wave function. Gianturco and Lucchese do not report cross sections, and Grandi and co-workers report only partial cross sections for some ͑D 2h ͒ symmetries.…”

Section: Introductionmentioning

confidence: 99%

Low-energy electron collisions with gas-phase uracil

Winstead

McKoy

2006

The Journal of Chemical Physics

View full text Add to dashboard Cite

We have studied gas-phase collisions between slow electrons and uracil molecules with a view to understanding the resonance structure of the scattering cross section. Our symmetry-resolved results for elastic scattering, computed in the fixed-nuclei, static-exchange and static-exchange-plus-polarization approximations, provide locations for the expected ‫ء‬ shape resonances and indicate the possible presence of a low-energy ‫ء‬ resonance as well. Electron-impact excitation calculations were carried out for low-lying triplet and singlet excitation channels and yield a very large singlet cross section. We discuss the connection between the resonances found in our elastic cross section and features observed in dissociative attachment.

show abstract

H−Desorption from Uracil via Metastable Electron Capture

Cited by 38 publications

References 21 publications

Elastic and inelastic low-energy electron collisions with pyrazine

Elastic and inelastic low-energy electron collisions with pyrazine

Stable Valence Anions of Nucleic Acid Bases and DNA Strand Breaks Induced by Low Energy Electrons

Low-energy electron collisions with gas-phase uracil

Contact Info

Product

Resources

About