X-ray absorption spectroscopy of Ce2O3+ and Ce2O5+ near Ce M-edge
X-ray absorption spectroscopy of Ce2O3+ and Ce2O5+ near Ce M-edge
复制标题
DOI：
10.1088/0953-4075/49/7/075101
复制
发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
T. Hayakawa;K. Egashira;M. Arakawa;T. Ito;Shun Sarugaku;Kota Ando;A. Terasaki
中科院分区：
文献类型：
--
作者：
T. Hayakawa;K. Egashira;M. Arakawa;T. Ito;Shun Sarugaku;Kota Ando;A. Terasaki
采用离子阱对自由铈氧化物团簇离子进行了X射线吸收光谱研究。Ce 2 O 3 +的X射线吸收光谱和Ce 2 O 5 +？>的Ce M-边缘的能量范围内获得。光谱由两个显著峰组成，对应于Ce M5-和M4-“白线”峰。峰的光子能量表明Ce在Ce 2 O3+？与形式价数相当。另一方面，Ce 2 O 5 +？>比形式价数小得多，这是一贯理解的假设，Ce 2 O 5 +？具有Ce 2 O3-O2构型，吸附有分子O2。因此，它表明，离子阱有利于XAS测量确定原子的电荷状态在一个自由的集群。
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 Ce 2 O 3 + ?> and Ce 2 O 5 + ?> were obtained in the energy range of the Ce M-edge. The spectra consisted of two prominent peaks corresponding to Ce M5- and M4-‘white line’ peaks. The photon energies of the peaks showed that the charge state of Ce in Ce 2 O 3 + ?> was comparable with a formal valence number. On the other hand, the estimated charge state of Ce in Ce 2 O 5 + ?> was much smaller than a formal valence number, which was consistently understood by assuming that Ce 2 O 5 + ?> has a Ce2O3–O2 configuration with a molecular O2 adsorbed. It was thus demonstrated that an ion trap facilitates XAS measurement for determining charge states of atoms in a free cluster.