Charge-state analysis of small barium-oxide clusters by x-ray absorption spectroscopy

Tetsuichiro Hayakawa, Masashi Arakawa, Kota Ando, Yuya Kiyomura, Tomoki Kawano, Akira Terasaki

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2 Citations (Scopus)


Small barium-oxide clusters Ba m O + n are studied by mass spectrometry and x-ray absorption spectroscopy (XAS) to discuss stability of the clusters and oxidation state of constituent atoms. It is found that clusters with bulk composition, n = m, are stable, which can accommodate one or two excess oxygen atoms additionally as manifested by n = m + 1 and m + 2 species in the mass spectrum. XAS spectra of Ba 2 O + 2 and Ba 2 O + 3 reveal that the oxidation state of barium atoms stays at +2 (the bulk BaO value) even after binding excess oxygen, whereas spectral features originating from oxygen exhibit composition dependence. The present finding suggests that stoichiometric small barium-oxide clusters bind lessnegatively-charged oxygen atoms without change in the charge state of barium.

Original languageEnglish
Article number134003
JournalJournal of Physics Condensed Matter
Issue number13
Publication statusPublished - Feb 4 2019

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics


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