Probing local spin ordering at surfaces by He2+ ions

M. Unipan, A.M. Robin, D.F.A. Winters, R.W.H. Morgenstern, R.A. Hoekstra

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16 Citations (Scopus)

Abstract

The evolution of the vibrational intensity distribution of the singly ionized A (2)Pi state in CO is experimentally examined for photon energy detunings below the adiabatic 0-0 transition of the O 1s -> 2 pi resonance. We have found a strong suppression of the entire vibrational fine structure of this state, leading to its almost complete quenching for certain excitation energies, followed by a partial restoring for larger values of negative photon energy detuning. Our observation, that cannot be rationalized by the known model of a vibrational collapse for energy detuning, may be explained in terms of a Fano interference between the direct and resonant photoionization channels in the presence of strong lifetime vibrational interference.

Original languageEnglish
Article number062901
Number of pages9
JournalPhysical Review A
Volume74
Issue number6
DOIs
Publication statusPublished - Dec-2006

Keywords

  • AUGER NEUTRALIZATION
  • ELECTRON-SCATTERING
  • POLARIZED ELECTRONS
  • GRAZING SCATTERING
  • HOLLOW ATOMS
  • AR IONS
  • COLLISIONS
  • MAGNETISM
  • EMISSION
  • NI(110)

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