Positron scattering from pyrazine
Journal Publication ResearchOnline@JCUAbstract
The present paper provides a joint experimental and theoretical study of positron scattering from pyrazine. Experimental data were measured employing a low-energy positron beamline, and covered an energy range from 1 to 79 eV. Cross sections were measured for total scattering, total elastic scattering, positronium formation, direct ionization, and the sum of the total discrete electronic-state excitation processes. In addition, measured total electronic excitation cross sections for the individual 11B3u, 11B2u, 11B1u, and 21B2u states are also reported. Finally, experimental elastic differential cross sections (DCSs), here in the energy range 1-20 eV, are also presented. Results from two theoretical approaches are given: the R-matrix approach and the independent atom method with screening corrected additivity rule and interference terms. Where a comparison between our experimental and theoretical results could be made, the level of accord varied from being quite good to marginal depending on the actual scattering process under consideration. Last, a comparison between the present elastic DCS results and those from our earlier study on positron scattering from pyrimidine [Palihawadana, Phys. Rev. A 88, 012717 (2013)PLRAAN1050-294710.1103/PhysRevA.88.012717] showed a somewhat unexpected level of agreement.
Journal
Physical Review A (Atomic, Molecular and Optical Physics)
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Volume
104
ISBN/ISSN
1094-1622
Edition
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Issue
4
Pages Count
12
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Publisher
American Physical Society
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EISSN
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DOI
10.1103/PhysRevA.104.042807