Electron-ion multiple coincidence spectroscopy for small molecules and clusters

Norio Saito, Xiao Jing Liu, Yuichiro Morishita, Isao H. Suzuki, Kiyoshi Ueda

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We have developed an electron-ion multiple coincidence technique at BL27SU at SPring-8 in Japan, which consists of electron and ion time-of-flight analyzers with multi-hit two-dimensional position sensitive detectors and a supersonic jet from a cooled nozzle. Recent studies on the electron-ion multiple coincidence experiments using this apparatus are reviewed in this paper. We discuss N 1s photoelectron angular distributions in the molecular frame for NO using a new projection analysis method. As an example of de-excitation processes, we have observed interatomic Coulombic decay (ICD) from an Auger-final dicationic state with 3s and 3p holes in the Ar trimer. This ICD process is unambiguously identified by the electron-ion-ion-ion coincidence technique in which the kinetic energy of the ICD electron and the kinetic energy release in the three Ar+ fragmentation are measured in coincidence.

Original languageEnglish
Pages (from-to)68-72
Number of pages5
JournalJournal of Electron Spectroscopy and Related Phenomena
Publication statusPublished - 2007 May


  • Ar trimer
  • Fixed-in-space molecule
  • Interatomic Coulombic decay
  • Multiple coincidence momentum imaging
  • NO
  • Photoelectron angular distribution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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