TY - JOUR
T1 - Ultraviolet photoelectron spectra of Er 2@C 82 (I), Er 2@C 82 (III), Er 2C 2@C 82 (I) and Er 2C 2@C 82 (III)
AU - Miyazaki, Takafumi
AU - Sumii, Ryohei
AU - Umemoto, Hisashi
AU - Okimoto, Haruya
AU - Ito, Yasuhiro
AU - Sugai, Toshiki
AU - Shinohara, Hisanori
AU - Zaima, Takeyuki
AU - Yagi, Hajime
AU - Hino, Shojun
N1 - Funding Information:
This study was conduced as part of a joint research program of UVSOR, Institute for Molecular Science. This work was supported by a Grant-in Aid for Scientific Research in the priority area molecular conductors (Grant No. 15073203 ) and a Grant-in Aid for Basic Scientific Research (Grant No. 18350068 ) from the Ministry of Education, Science, Sports, and Culture, Japan. This work is also supported by a Subsidy to Create Center of Excellence from Ehime University.
PY - 2012/3/13
Y1 - 2012/3/13
N2 - Ultraviolet photoelectron spectra (UPS) and X-ray photoelectron spectra (XPS) of two erbium atoms and an erbium-carbide cluster entrapped fullerenes, Er 2@C 82 (I), Er 2@C 82 (III), Er 2C 2@C 82 (I) and Er 2C 2@C 82 (III), were measured using a synchrotron radiation light source and MgKα 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@C 82 (I) of 0.4 eV. The UPS of erbium atoms encapsulated endohedral fullerenes having the same C 82 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 C 82 cage structure. The XPS Er4d 5/2 peak of Er 2@C 82 suggests the oxidation state of (Er 3+) 2 @C826-. The difference spectrum between the UPS of Er 2@C 82 (III) and Er 2C 2@C 82 (III) has the same C 3v structure reveals two excess electrons on the cage of Er 2@C 82.
AB - Ultraviolet photoelectron spectra (UPS) and X-ray photoelectron spectra (XPS) of two erbium atoms and an erbium-carbide cluster entrapped fullerenes, Er 2@C 82 (I), Er 2@C 82 (III), Er 2C 2@C 82 (I) and Er 2C 2@C 82 (III), were measured using a synchrotron radiation light source and MgKα 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@C 82 (I) of 0.4 eV. The UPS of erbium atoms encapsulated endohedral fullerenes having the same C 82 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 C 82 cage structure. The XPS Er4d 5/2 peak of Er 2@C 82 suggests the oxidation state of (Er 3+) 2 @C826-. The difference spectrum between the UPS of Er 2@C 82 (III) and Er 2C 2@C 82 (III) has the same C 3v structure reveals two excess electrons on the cage of Er 2@C 82.
KW - C
KW - Electronic structure
KW - Endohedral fullerenes
KW - Ultraviolet photoelectron spectroscopy
KW - X-ray photoelectron spectroscopy
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U2 - 10.1016/j.chemphys.2012.01.007
DO - 10.1016/j.chemphys.2012.01.007
M3 - Article
AN - SCOPUS:84858076275
SN - 0301-0104
VL - 397
SP - 87
EP - 91
JO - Chemical Physics
JF - Chemical Physics
IS - 1
ER -