Polarization studies of Lyman-α radiation emitted in atom-H2-molecule collisions

  • Danielle Dowek
  • Galip Tepehan
  • Helmut Madeheim
  • Rainer Hippler
Article

Abstract

A polarization study of Lyman-α radiation emitted in collisions of H+, H, He+, and He projectiles with H2 molecules has been performed at projectile energies ranging from 1–25 keV. In H+−H2 and H−H2 collisions, the measured linear polarization is negative at low incident velocities, indicating a preferred alignment of the excited electron charge cloud perpendicular to the incident projectile direction. This is taken as significance for a rotational coupling which in these two collision systems predominantly populates the H(2p±1) substates. In He+−H2 and He−H2 collisions, the measured linear polarization is about zero and independent of the projectile energy. In these more asymmetric systems,a′−a′ and a′−a″ couplings are now of comparable magnitude.

PACS

34.50.Fa 34.50.Gp 

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Danielle Dowek
    • 1
  • Galip Tepehan
    • 1
    • 3
  • Helmut Madeheim
    • 1
  • Rainer Hippler
    • 1
  1. 1.Fakultät für PhysikUniversität BielefeldBielefeld 1Federal Republic of Germany
  2. 2.L.C.A.M., Bât. 351Université Paris-SudOrsayFrance
  3. 3.Physics Department, Faculty of Science and LetterTechnical University of Istanbul, MaslakIstanbulTurkey

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