Coherent excitation of H(n=2) in H+, H - He collisions

  • R. Hippler
  • O. Plotzke
  • W. Harbich
  • H. Madeheim
  • H. Kleinpoppen
  • H. O. Lutz
Article

Abstract

The coherent excitation of H(n=2) in H+, H - He collisions was investigated at incident energies of 5–25 keV. From a polarization analysis of the emitted Lyman-α radiation as a function of an external electric field, the partial cross sections for excitation to the H(2s) and the H(2pm) magnetic substates and the real part of thesp0-coherence were extracted. For H+-He collisions, the measured partial cross sections are in fair agreement with previous two-electron calculations by Kimura and Lin; the agreement with one-electron calculations of Jain et al. is, particularly at the lower incident energies, less satisfactory. For both collision systems, an energy-dependent forward-backward asymmetry corresponding to a shift of the center-of-charge relative to the center-of-mass (dipole moment) was observed. In H+ - He collisions, the measured dipole moment was positive; it thus corresponds to an electron trailing behind the proton. The same analysis applied to the H - He system showed the electron riding in front of the proton.

PACS

34.50.Fa 34.70.+e 32.60.+i 

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • R. Hippler
    • 1
  • O. Plotzke
    • 1
    • 2
  • W. Harbich
    • 1
    • 3
  • H. Madeheim
    • 1
  • H. Kleinpoppen
    • 1
  • H. O. Lutz
    • 1
  1. 1.Fakultät für PhysikUniversität BielefeldBielefeld 1Germany
  2. 2.Fritz-Haber-Institut, Abt. OberflächenphysikBerlin 33Germany
  3. 3.Departement Physique Expérimentale, EcublensEcole Polytechnique Fédérale de LausanneLausanneSwitzerland
  4. 4.Atomic Physics LaboratoryUniversity of StirlingStirlingScotland

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