X-ray absorption spectroscopy of Ce2O3+ and Ce2O5+ near Ce M-edge

作者：Hayakawa Tetsuichiro^*; Egashira Kazuhiro; Arakawa Masashi; Ito Tomonori; Sarugaku Shun; Ando Kota; Terasaki Akira^*

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2016, 49(7): 075101.

DOI：10.1088/0953-4075/49/7/075101

• cerium oxide clusters
• x-ray absorption spectroscopy
• charge state
• ion trap
• ion spectroscopy

X-ray absorption spectroscopy (XAS) of size-selected free cerium-oxide cluster ions has been carried out by employing an ion trap. X-ray absorption spectra of Ce2O3+ and Ce2O5+ were obtained in the energy range of the Ce M-edge. The spectra consisted of two prominent peaks corresponding to Ce M-5- and M-4-'white line' peaks. The photon energies of the peaks showed that the charge state of Ce in Ce2O3+ was comparable with a formal valence number. On the other hand, the estimated charge state of Ce in Ce2O5+ was much smaller than a formal valence number, which was consistently understood by assuming that Ce2O5+ has a Ce2O3-O-2 configuration with a molecular O-2 adsorbed. It was thus demonstrated that an ion trap facilitates XAS measurement for determining charge states of atoms in a free cluster.

• 出版日期2016-4-14