中国物理B ›› 1995, Vol. 4 ›› Issue (10): 738-756.doi: 10.1088/1004-423X/4/10/003

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ELECTRONIC STRUCTURE STUDIES OF THE C60 FILM CONDENSED ON 2H-MoS2(0001) SURFACE

陈挺1, 钱生法2, 王刚2, 解思深2, 陆华3, 沈电洪3, 包昌林3, 张小军3, 张青哲3, 崔玉德3, 谢侃3, 林彰达3   

  1. (1)Department of Physics, the Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; (2)Institute of Physics, Academia Sinica, Beijing 100080, China; (3)State Key Laboratory for Surface Physics, Institute of Physics, Academia Sinica, Beijing 100080, China
  • 收稿日期:1995-02-20 出版日期:1995-10-20 发布日期:1995-10-20

ELECTRONIC STRUCTURE STUDIES OF THE C60 FILM CONDENSED ON 2H-MoS2(0001) SURFACE

LU HUA (陆华), CHEN TING (陈挺)a, SHEN DIAN-HONG (沈电洪), BAO CHANG-LIN (包昌林), ZHANG XIAO-JUN (张小军), ZHANG QING-ZHE (张青哲), CUI YU-DE (崔玉德), XIE KAN (谢侃), QIAN SHENG-FA (钱生法)b, WANG GANG (王刚)b, XIE SI-SHEN (解思深)b, LIN ZHANG-DA (林彰达)   

  1. State Key Laboratory for Surface Physics, Institute of Physics, Academia Sinica, Beijing 100080, China; a Department of Physics, the Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; b Institute of Physics, Academia Sinica, Beijing 100080, China
  • Received:1995-02-20 Online:1995-10-20 Published:1995-10-20

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摘要： The electronic structure and vibrational spectrum of the C60 film condensed on a 2H- MoS2(0001) surface have been investigated by X-ray photoelectron spectroscopy (XPS), ul-traviolet photoelectron spectroscopy (UPS), Auger electron spectroscopy (AES) and infrared high-resolution electron-energy-loss spectroscopy (HREELS). AES analysis showed that at low energy side of the main transition, C60 contains a total of three peaks just like that of graphite. However, the energy position of the KLL main Auger transition of C60 looks like that of diamond, indicating that the hybridization of the carbon atoms in C60 is not strictly in sp2- bonded state but that the curvature of the molecular surface introduces some sp2pz- bonded character into the molecular orbitals. XPS showed that the C 1s binding energy in C60 was 285.0eV, and its main line was very symmetric and offered no indication of more than a single carbon species. In UPS measurement the valence band spectrum of C60 within 10eV below the Fermi level (EF) shows a very distinct five-band structure that character-izes the electronic structure of the C60 molecule. HREEL results showed that the spectrum obtained from the C60 film has very rich vibrational structure. At least, four distinct main loss peaks can be identified below 200 meV. The most intense loss was recorded at 66 meV, and relatively less intense losses were recorded at 95, 164 and 197meV at a primary energy of electron beam EP = 2.0eV. The other energy-loss peaks at 46, 136, 157 and 186meV in HREEL spectrum are rather weak. These results have been compared to infrared spectrum data of the crystalline solid C60 taken from recent literatures.

Abstract: The electronic structure and vibrational spectrum of the C60 film condensed on a 2H- MoS2(0001) surface have been investigated by X-ray photoelectron spectroscopy (XPS), ul-traviolet photoelectron spectroscopy (UPS), Auger electron spectroscopy (AES) and infrared high-resolution electron-energy-loss spectroscopy (HREELS). AES analysis showed that at low energy side of the main transition, C60 contains a total of three peaks just like that of graphite. However, the energy position of the KLL main Auger transition of C60 looks like that of diamond, indicating that the hybridization of the carbon atoms in C60 is not strictly in sp2- bonded state but that the curvature of the molecular surface introduces some sp2pz- bonded character into the molecular orbitals. XPS showed that the C 1s binding energy in C60 was 285.0eV, and its main line was very symmetric and offered no indication of more than a single carbon species. In UPS measurement the valence band spectrum of C60 within 10eV below the Fermi level (EF) shows a very distinct five-band structure that character-izes the electronic structure of the C60 molecule. HREEL results showed that the spectrum obtained from the C60 film has very rich vibrational structure. At least, four distinct main loss peaks can be identified below 200 meV. The most intense loss was recorded at 66 meV, and relatively less intense losses were recorded at 95, 164 and 197meV at a primary energy of electron beam EP = 2.0eV. The other energy-loss peaks at 46, 136, 157 and 186meV in HREEL spectrum are rather weak. These results have been compared to infrared spectrum data of the crystalline solid C60 taken from recent literatures.

中图分类号:  (Fullerenes and related materials; intercalation compounds)

  • 71.20.Tx
79.60.-i (Photoemission and photoelectron spectra) 78.30.Na (Fullerenes and related materials) 79.20.Fv (Electron impact: Auger emission)