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Journal of Chemical Physics / Volume 136 / Issue 2 / ARTICLES / Gas Phase Dynamics and Structure: Spectroscopy, Molecular Interactions, Scattering, and Photochemistry

J. Chem. Phys. 136, 024304 (2012); http://dx.doi.org/10.1063/1.3675167 (6 pages)

Experimental and theoretical investigation of the triple differential cross section for electron impact ionization of pyrimidine molecules

J. D. Builth-Williams1, S. M. Bellm1, D. B. Jones1, Hari Chaluvadi2, D. H. Madison2, C. G. Ning3, B. Lohmann4, and M. J. Brunger1,5

1ARC Centre of Excellence for Antimatter-Matter Studies, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia
2Department of Physics, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
3Department of Physics and Key Laboratory of Atomic and Molecular NanoSciences of MOE, Tsinghua University, Beijing 100084, People's Republic of China
4University of the Sunshine Coast, Maroochydore DC, Queensland 4558, Australia
5Institute of Mathematical Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia

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(Received 14 November 2011; accepted 14 December 2011; published online 9 January 2012)

Cross-section data for electron impact induced ionization of bio-molecules are important for modelling the deposition of energy within a biological medium and for gaining knowledge of electron driven processes at the molecular level. Triply differential cross sections have been measured for the electron impact ionization of the outer valence 7b2 and 10a1 orbitals of pyrimidine, using the (e, 2e) technique. The measurements have been performed with coplanar asymmetric kinematics, at an incident electron energy of 250 eV and ejected electron energy of 20 eV, for scattered electron angles of −5°, −10°, and −15°. The ejected electron angular range encompasses both the binary and recoil peaks in the triple differential cross section. Corresponding theoretical calculations have been performed using the molecular 3-body distorted wave model and are in reasonably good agreement with the present experiment.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL DETAILS
  3. THEORETICAL FRAMEWORK
  4. RESULTS AND DISCUSSION
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

electron impact ionisation, macromolecules, molecular biophysics, molecule-electron collisions, organic compounds

PACS

  • 34.80.Gs

    Molecular excitation and ionization

  • 87.15.-v

    Biomolecules: structure and physical properties

  • 36.20.-r

    Macromolecules and polymer molecules

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3675167

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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