Electron band structure of C_(60) single crystal has been investigated using synchrotron radiation.On the cleaved(111)surface of the C_(60) single crystal the angle-resolved ultraviolet photoelectron spectra were meas...Electron band structure of C_(60) single crystal has been investigated using synchrotron radiation.On the cleaved(111)surface of the C_(60) single crystal the angle-resolved ultraviolet photoelectron spectra were measured at normal emission with varying photon energy from 12.7 to 28.2eV.The valence band dispersions in L-r-L direction were successfully observed.The dispersions are 0.14 and 0.17eV for the highest occupied molecular orbitals(HOMO)and HOMO-1 derived band respectively.展开更多
For submonolayer amounts of C_(60)condensed on Sn substrate,the peaks derived from top two occupied molecular orbitals were broadened by 0.3eV in comparison with solid C_(60).For coverageθ<1 monolayer,the broadeni...For submonolayer amounts of C_(60)condensed on Sn substrate,the peaks derived from top two occupied molecular orbitals were broadened by 0.3eV in comparison with solid C_(60).For coverageθ<1 monolayer,the broadenings are independent of the coverage.It indicates that the delocalizations of electrons in valence bands of C_(60)are weak and the widths do not reflect the true band dispersions.展开更多
For near monolayer(ML)C_(60) condensed on Sn substrate,x-ray photoemission studies of Cls level reveal a feature centered about 22eV below the main peak.Analyses show that the feature is caused by the plasmon loss of ...For near monolayer(ML)C_(60) condensed on Sn substrate,x-ray photoemission studies of Cls level reveal a feature centered about 22eV below the main peak.Analyses show that the feature is caused by the plasmon loss of the two dimensional C_(60) film.Bulk plasmon loss peak(~28 eV blow the main peak),which has been observed on thick C_(60) films,was not observed on the C_(60) films with coverageθ<2 ML.It indicates that the 28eV energy loss feature is due to a bulk plasmon associated with the solid C_(60) but not a single C_(60) molecule.展开更多
基金Supported by the National Natural Science Foundation of China,No.19234010.
文摘Electron band structure of C_(60) single crystal has been investigated using synchrotron radiation.On the cleaved(111)surface of the C_(60) single crystal the angle-resolved ultraviolet photoelectron spectra were measured at normal emission with varying photon energy from 12.7 to 28.2eV.The valence band dispersions in L-r-L direction were successfully observed.The dispersions are 0.14 and 0.17eV for the highest occupied molecular orbitals(HOMO)and HOMO-1 derived band respectively.
基金Supported by the National Natural Science Foundation of China No.19174003One of authors,Xun Kun,is also indebted to Shandong Province for support through Grant No.90A1111.
文摘For submonolayer amounts of C_(60)condensed on Sn substrate,the peaks derived from top two occupied molecular orbitals were broadened by 0.3eV in comparison with solid C_(60).For coverageθ<1 monolayer,the broadenings are independent of the coverage.It indicates that the delocalizations of electrons in valence bands of C_(60)are weak and the widths do not reflect the true band dispersions.
基金Supported by the National Natural Science Foundation of China,under Grant No.19174003One of authors,Xun Kun,is also Indebted to Shangdong Province for Support through Grant No.90 A 1111.
文摘For near monolayer(ML)C_(60) condensed on Sn substrate,x-ray photoemission studies of Cls level reveal a feature centered about 22eV below the main peak.Analyses show that the feature is caused by the plasmon loss of the two dimensional C_(60) film.Bulk plasmon loss peak(~28 eV blow the main peak),which has been observed on thick C_(60) films,was not observed on the C_(60) films with coverageθ<2 ML.It indicates that the 28eV energy loss feature is due to a bulk plasmon associated with the solid C_(60) but not a single C_(60) molecule.
