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Ionization of uracil in collisions with fast bare ions

  • L. C. TribediEmail author
  • A. N. Agnihotri
  • M. E. Galassi
  • R. D. Rivarola
  • C. Champion
Regular Article
Part of the following topical collections:
  1. Topical issue: Atomic Cluster Collisions

Abstract

We study the atomic collisions with large molecules and simple atoms. The ionization and fragmentation spectra are investigated for uracil, a RNA base molecule, under the impact of fast bare C, O and F-ions. The experiments are conducted using a recoil-ion time-of-flight spectrometer. The energy dependence of the total ionization cross sections (TCS) and fragmentation yields are measured for MeV/u energies. In addition, the angular distribution of the electron double differential cross sections (DDCS) are also shown in some cases. The total cross sections of ionization and also the DDCS data are compared with the CDW-EIS calculations. The qualitative agreement is good but, in general, the theory tends to overestimate the data by a factor of 2.2. The angular distribution of electrons clearly indicates a good qualitative agreement except for the lowest energy electrons.

Keywords

Topical issue: Atomic Cluster Collisions. Guest editors: Andrey V. Solov’yov and Andrey V. Korol 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • L. C. Tribedi
    • 1
    Email author
  • A. N. Agnihotri
    • 1
  • M. E. Galassi
    • 2
  • R. D. Rivarola
    • 2
  • C. Champion
    • 3
  1. 1.Tata Institute of Fundamental ResearchMumbaiIndia
  2. 2.Laboratorio de Colisiones Atómicas, Instituto de Física RosarioUniversidad Nacional de Rosario and CONICETRosarioArgentina
  3. 3.Laboratoire de Physique Moléculaire et des CollisionsUniversité Paul Verlaine-MetzMetz Cedex 01France

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