Ion pair formation in the NeAr dimer irradiated by monochromatic soft X-rays

T. Ouchi, V. Stumpf, T. Miteva, Hironobu Fukuzawa, K. Sakai, X. J. Liu, T. Mazza, M. Schöffler, H. Iwayama, K. Nagaya, Y. Tamenori, N. Saito, A. I. Kuleff, K. Gokhberg, Kiyoshi Ueda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We investigated Ne+–Ar+ ion-pair formation which follows irradiation of the NeAr dimer by monochromatic soft X-rays. Using momentum-resolved electron-ion multicoincidence spectroscopy, we could unambiguously identify that the formation of the ion pair at photon energy of 200.5 eV proceeds via interatomic Coulombic decay (ICD) of the Ne+(2s−1)Ar inner-valence ionized and NeAr+(3p−25d) ionization satellite states. Photoabsorption at higher photon energies of 268.2 eV and 888.7 eV leads to the emission of core electrons of Ar and Ne respectively, and to the subsequent local Auger decay process. We demonstrate that at these energies the ion pair formation originating in the doubly ionized Ar L-MM and Ne K-LL Auger final states proceeds mostly via radiative charge transfer and charge transfer driven by non-adiabatic coupling mechanisms.

Original languageEnglish
Pages (from-to)178-184
Number of pages7
JournalChemical Physics
Publication statusPublished - 2017 Jan 12

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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