Single ionization of hydrogen molecules by fast protons as a function of the molecular alignment

Phys. Rev. A 72, 052711 – Published 16 November 2005
Nora G. Johnson, R. N. Mello, Michael E. Lundy, J. Kapplinger, Eli Parke, K. D. Carnes, I. Ben-Itzhak, and E. Wells


Relative cross sections for the 4MeV H++D2 (Σg+1)H++D2+(1sσ)+e ionization process were measured as a function of the molecular alignment during the interaction. The angle between the molecular axis and the projectile was obtained by using a momentum imagining technique and isolating the events in which the D2+(1sσ) ions are excited to the vibrational continuum and subsequently dissociate. While anisotropic cross sections have been observed in the past for a number of collision processes involving both target electrons, the one electron process investigated here is isotropic within our experimental uncertainties.


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  • Received 24 August 2005
  • Published 16 November 2005

© 2005 The American Physical Society

Authors & Affiliations

Nora G. Johnson1,2, R. N. Mello1, Michael E. Lundy1, J. Kapplinger1, Eli Parke2, K. D. Carnes2, I. Ben-Itzhak2, and E. Wells1,*

  • 1Department of Physics, Augustana College, Sioux Falls, South Dakota 57197, USA
  • 2J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA

  • *Electronic address:

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