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Related Experiment Videos

Charge driven fragmentation of nucleobases.

J de Vries1, R Hoekstra, R Morgenstern

  • 1KVI Atomic Physics, Rijksuniversiteit Groningen, Zernikelaan 25, 9747AA Groningen, The Netherlands.

Physical Review Letters
|August 9, 2003
PubMed
Summary

Highly charged ions interacting with nucleobases cause multiple ionization and fragmentation. Fragment energies depend on the ion

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Area of Science:

  • Atomic and Molecular Physics
  • Chemical Physics
  • Biophysics

Background:

  • Nucleobases are fundamental building blocks of DNA and RNA.
  • Understanding their response to energetic ions is crucial for radiobiology and astrochemistry.
  • Previous studies often focused on lower charge states or different molecular targets.

Purpose of the Study:

  • To investigate the multiple ionization and fragmentation pathways of single nucleobases.
  • To determine the influence of highly charged ion impact on molecular stability.
  • To elucidate charge distribution and fragmentation dynamics in ionized nucleobases.

Main Methods:

  • Irradiation of single nucleobases with slow, highly charged Xenon ions (Xe(q+), q=5-25).
  • Analysis of fragment kinetic energies using high-resolution coincidence time-of-flight spectrometry.
  • Correlating fragment energies with the initial charge state and molecular environment.

Main Results:

  • Observed strong dependence of fragment kinetic energies on the initial charge state of the parent ion.
  • Demonstrated a significant influence of the initial chemical environment on fragmentation patterns.
  • Provided insights into the distribution of charge within the ionized nucleobases.

Conclusions:

  • The fragmentation dynamics of nucleobases are highly sensitive to the projectile's charge state.
  • The molecular structure dictates how charge is distributed and influences fragment release.
  • This study offers a detailed understanding of ion-molecule interactions for biologically relevant systems.

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