Ultraviolet photoelectron spectra of Er₂@C₈₂ (I), Er₂@C₈₂ (III), Er₂C₂@C₈₂ (I) and Er₂C₂@C₈₂ (III)

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• 作者：Takafumi Miyazaki^a ; ^{miyazaki@eng.ehime-u.ac.jp} ; Ryohei Sumii^b ; ^c ; Hisashi Umemoto^d ; Haruya Okimoto^d ; Yasuhiro Ito^d ; Toshiki Sugai^d ; Hisanori Shinohara^d ; Takeyuki Zaima^a ; Hajime Yagi^a ; Shojun Hino^a ; ^{hino@eng.ehime-u.ac.jp}
• 关键词：Endohedral fullerenes ; C82 ; Ultraviolet photoelectron spectroscopy ; X-ray photoelectron spectroscopy ; Electronic structure
• 刊名：Chemical Physics
• 出版年：2012
• 期刊代码：18_03010104
• 类别：ch
• 出版时间：13 March, 2012
• 卷：397
• 期：Complete
• 页码：87-91
• 文件大小：838 K

摘要

Ultraviolet photoelectron spectra (UPS) and X-ray photoelectron spectra (XPS) of two erbium atoms and an erbium-carbide cluster entrapped fullerenes, Er₂@C₈₂ (I), Er₂@C₈₂ (III), Er₂C₂@C₈₂ (I) and Er₂C₂@C₈₂ (III), were measured using a synchrotron radiation light source and MgK伪 X-ray gun. The spectral onset energy of these endohedral fullerenes is around 0.8-0.9 eV, which is larger than that of Er@C₈₂ (I) of 0.4 eV. The UPS of erbium atoms encapsulated endohedral fullerenes having the same C₈₂ cage structure were analogous while those of the different cage structure are different. This finding supports an empirical rule that the electronic structure of the endohedral fullerenes is principally governed by the C₈₂ cage structure. The XPS Er4d_5/2 peak of Er₂@C₈₂ suggests the oxidation state of @. The difference spectrum between the UPS of Er₂@C₈₂ (III) and Er₂C₂@C₈₂ (III) has the same C_3v structure reveals two excess electrons on the cage of Er₂@C₈₂.