Photoelectron-photoion-photoion coincidence in Ar dimers

A. De Fanis, M. Oura, N. Saito, M. Machida, M. Nagoshi, A. Knapp, J. Nickles, A. Czasch, R. Dörner, Y. Tamenori, H. Chiba, M. Takahashi, J. H.D. Eland, K. Ueda

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Photoelectron-photoion-photoion coincidence momentum imaging was applied to study 2p photoemission from Ar dimers. We present measurements of the kinetic energy released in fragmentation of Ar2++, angular distributions of energetic fragments, angular distributions of photoelectrons in the laboratory frame and in the molecular frame. The mean kinetic energy of fragment Ar+ ions, 2.2 eV, is larger than the value estimated from the Coulomb explosion model with the equilibrium Ar-Ar distance. No significant differences between the photoelectron angular distributions of monomers and dimers can be found in the laboratory frame. The photoelectron angular distributions of dimers in the molecular frame show a minimum for electron emission along the dimer axis at low energies (1.2 and 3.4 eV) and become isotropic at higher kinetic energies.

Original languageEnglish
Pages (from-to)L235-L242
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume37
Issue number12
DOIs
Publication statusPublished - 2004 Jun 28

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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