TY - JOUR
T1 - Charge-state analysis of small barium-oxide clusters by x-ray absorption spectroscopy
AU - Hayakawa, Tetsuichiro
AU - Arakawa, Masashi
AU - Ando, Kota
AU - Kiyomura, Yuya
AU - Kawano, Tomoki
AU - Terasaki, Akira
N1 - Funding Information:
We thank Professor Kenta Amemiya for his technical support in the beamline BL-7A, KEK-PF. This work has been supported by the Special Cluster Research Project of Genesis Research Institute, Inc., and by JSPS KAKENHI Grant Number JP26390005. XAS measurement was performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2016G183). DFT calculations were performed by the computing system at the Research Institute for Information Technology, Kyushu University.
Publisher Copyright:
© 2019 IOP Publishing Ltd.
PY - 2019/2/4
Y1 - 2019/2/4
N2 - 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.
AB - 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.
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U2 - 10.1088/1361-648X/aafe18
DO - 10.1088/1361-648X/aafe18
M3 - Article
C2 - 30641497
AN - SCOPUS:85061240969
VL - 31
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 13
M1 - 134003
ER -