Scanning Tunneling Microscopy/Spectroscopy of La2@C72 Multilayer Islands on Si(100)-2$\times$1-H Surfaces
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概要
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We have investigated structural and electronic properties of La2@C72 multi layer islands grown on a hydrogen-terminated Si(100)-2$\times$1-H surface using ultra-high-vacuum scanning tunneling microscopy/spectroscopy (STM/STS) and theoretical calculations based on first principles. The La2@C72 molecules are observed by STM as ellipsoids, consistent with the NMR results [H. Kato et al.: J. Am. Chem. Sci. 125 (2003) 7782], indicating that, out of 24 isomers only two, with $D_{2}$ symmetry and with a non-IPR (isolated pentagon rule) structure are possible. The energy gap for the carbon cage of the La2@C72 multi layer islands is measured by STS as 1.4 eV, suggesting that the C72 carbon cage is stabilized by a charge transfer from the encaged La atoms to the fullerene cage. The La-atom derived LUMO states are localized near the encapsulated La atoms and observed as a midgap-like density of states by STS.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-05-15
著者
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Heike Seiji
Advanced Research Laboratory Hitachi Ltd.
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Kato Haruhito
Department Of Chemistry Nagoya University
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SHINO Kazuhiro
Department of Chemistry, Nagoya University
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Sugai Toshiki
Department Of Chemistry And Institute For Advanced Research Nagoya University
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Suwa Yuji
Advanced Research Laboratory Hitachi Ltd.
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Taninaka Atsushi
Department Of Chemistry Nagoya University
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Terada Yasuhiko
Advanced Research Laboratory Hitachi Ltd.
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Shinohara Hisanori
Department Of Cardiology And Clinical Research
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Hashizume Tomihiro
Advanced Research Lab., Hitachi, Ltd., Hatoyama, Saitama 350-0395, Japan
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Taninaka Atsushi
Department of Chemistry, Nagoya University, Nagoya 464-8602, Japan
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Kato Haruhito
Department of Chemistry, Nagoya University, Nagoya 464-8602, Japan
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Heike Seiji
Advanced Research Lab., Hitachi, Ltd., Hatoyama, Saitama 350-0395, Japan
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