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Phys. Rev. A 57, 3621 - 3626 (1998)

Coulomb three-body effects in electron-impact ionization of argon

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B. Rouvellou1, S. Rioual1, J. Röder2, A. Pochat1, J. Rasch3, Colm T. Whelan3, H. R. J. Walters4, and R. J. Allan5
1Laboratoire des Collisions Electroniques et Atomiques, Université de Bretagne Occidentale, UFR Sciences et Techniques, 6 avenue Victor Le Gorgeu, 29285 Brest Cedex, France
2Fachbereich Physik, Universität Kaiserslautern, E. Schrödinger Straße, 67663 Kaiserslautern, Germany
3Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, United Kingdom
4Department of Applied Mathematics and Theoretical Physics, The Queen’s University of Belfast, Belfast BT7 1NN, United Kingdom
5Daresbury Laboratory, Warrington WA4 4AD, United Kingdom

Received 12 November 1997

Triple differential cross sections have been measured for the electron impact ionization of a 3p shell of argon in coplanar geometries. Results are presented for 40, 20, 8, and 2 eV excess energy with respect to ionization threshold, this energy being equally shared between both outgoing electrons in the final state. Comparison is made with distorted wave Born approximation calculations that include initial channel polarization and final channel post-collisional interaction. Results are shown to be very sensitive to few-body effects in both incident and final channels; however, agreement remains poor and the experimental results present a substantial challenge to theory.


©1998 The American Physical Society

URL: http://link.aps.org/abstract/PRA/v57/p3621
DOI: 10.1103/PhysRevA.57.3621
PACS: 34.80.Dp

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