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
A shift about 0.3eV to higher binding energy is reported in the valence band and Cls core level of Kx C_(60)(x<0.2).Analysis shows that the result could not be interpreted by a mixture of C_(60) and K3 C_(60).A dul...A shift about 0.3eV to higher binding energy is reported in the valence band and Cls core level of Kx C_(60)(x<0.2).Analysis shows that the result could not be interpreted by a mixture of C_(60) and K3 C_(60).A dulite K-doped phase and fermi level pinning near the lowest unoccupied molecular orbital derived band caused by K-doping are proposed.展开更多
Photoemission spectra of vacuum deposited K-incorporated C_(60)-K_(x)C_(60)(x≈6),before and after exposure to oxygen,show that the interaction between oxygen and potassium forms an overlayer of 40 A K-O complex with ...Photoemission spectra of vacuum deposited K-incorporated C_(60)-K_(x)C_(60)(x≈6),before and after exposure to oxygen,show that the interaction between oxygen and potassium forms an overlayer of 40 A K-O complex with stoichiometry near to that of potassium peroxide K_(2)O_(2) on the surface.In contrary to the oxidation of potassium film,no potassium oxide K_(2)O has been observed.展开更多
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.
基金Supported in Part by the National Natural Science Foundation of China with Grant No.191174003。
文摘A shift about 0.3eV to higher binding energy is reported in the valence band and Cls core level of Kx C_(60)(x<0.2).Analysis shows that the result could not be interpreted by a mixture of C_(60) and K3 C_(60).A dulite K-doped phase and fermi level pinning near the lowest unoccupied molecular orbital derived band caused by K-doping are proposed.
基金Supported by the National Natural Science Foundation of China with Grant No.19174003。
文摘Photoemission spectra of vacuum deposited K-incorporated C_(60)-K_(x)C_(60)(x≈6),before and after exposure to oxygen,show that the interaction between oxygen and potassium forms an overlayer of 40 A K-O complex with stoichiometry near to that of potassium peroxide K_(2)O_(2) on the surface.In contrary to the oxidation of potassium film,no potassium oxide K_(2)O has been observed.
