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Bond selective dissociative electron attachment to thymine.

S Ptasińska1, S Denifl, B Mróz

  • 1Institut für Ionenphysik, The Center of Molecular Bioscience Innsbruck, Leopold Franzens Universität, Technikerstrasse 25, A-6020 Innsbruck, Austria. sylwia.ptasinska@uibk.ac.at

The Journal of Chemical Physics
|January 6, 2006
PubMed
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Free-electron attachment to thymine and deuterated thymine reveals electron energy dictates hydrogen atom loss. This study explores anion formation and bond selectivity in biologically relevant molecules.

Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Molecular Physics

Background:

  • Thymine is a fundamental DNA nucleobase.
  • Understanding electron interactions with biomolecules is crucial for radiation biology and medicine.
  • Previous studies have explored electron scattering with DNA bases, but detailed fragment anion analysis is ongoing.

Purpose of the Study:

  • To investigate the mechanism of free-electron attachment to thymine.
  • To analyze the formation of fragment anions (loss of H or D atoms) as a function of electron energy.
  • To determine the bond selectivity in hydrogen/deuterium atom loss using partially deuterated thymine.

Main Methods:

  • Utilized a crossed electron/neutral beam apparatus.
  • Employed a quadrupole mass spectrometer to detect fragment anions.

Related Experiment Videos

  • Studied electron energies ranging from approximately 0 to 15 eV.
  • Incorporated quantum-chemical calculations to support experimental findings.

    • Main Results:

    • Observed the formation of fragment anions resulting from the loss of one or two hydrogen (or deuterium) atoms.
    • Demonstrated that the bond selectivity for H/D atom loss is solely dependent on the incident electron's kinetic energy.
    • Identified specific electron energy ranges associated with distinct fragmentation pathways.

    Conclusions:

    • The kinetic energy of incident electrons is the primary determinant of bond selectivity in thymine anion fragmentation.
    • Free-electron attachment provides a sensitive probe for studying molecular structure and dissociation dynamics in nucleobases.
    • This research contributes to understanding the initial steps of radiation damage to DNA at the molecular level.