Experimental evidence for a virtual state in a cold collision: Electrons and carbon dioxide

Phys. Rev. A 64, 022708 – Published 9 July 2001
D. Field, N. C. Jones, S. L. Lunt, and J.-P. Ziesel


Experimental data are presented for the scattering of cold electrons by CO2, for both integral and backward scattering, down to energies of a few meV with an energy resolution of 0.95–1.5 meV (full width at half maximum) in the electron beam. The experimental data show evidence for the phenomenon of virtual-state scattering, a subject of extensive theoretical study. The measured scattering cross sections rise rapidly at low energy, to a limiting value in integral scattering in excess of 120 Å2. In addition, analysis shows that scattering is s-wave dominated and that the s-wave scattering length is negative. All features are characteristic of virtual state scattering.

DOI: http://dx.doi.org/10.1103/PhysRevA.64.022708

  • Received 21 November 2000
  • Published 9 July 2001

© 2001 The American Physical Society

Authors & Affiliations

D. Field1,*, N. C. Jones1, S. L. Lunt1, and J.-P. Ziesel2

  • 1Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark
  • 2Laboratoire Collisions Agrégats Réactivité (CNRS UMR5589), Université Paul Sabatier, 31062 Toulouse, France

  • *Corresponding author. Email address: dfield@ifa.au.dk

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