Unoccupied states in C60 thin films probed by two-photon photoemission

被引:46
作者
Dutton, G [1 ]
Zhu, XY [1 ]
机构
[1] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA
关键词
D O I
10.1021/jp0256589
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Unoccupied electronic states in C-60 thin films on Cu(111) have been measured by laser two-photon photoemission (2PPE) spectroscopy. These measurements allow the quantitative determination of energetic positions for the lowest unoccupied molecular orbital (LUMO), LUMO + 1, LUMO + 2, image potential states, as well as the highest occupied molecular orbital (HOMO). The transiently populated LUMO and LUMO + 1 levels are stabilized by the on-molecule charge correlation energy during the 2PPE process. Compared to previous measurements using one-photon photoemission and inverse photoemission, the HOMO-LUMO gap determined by 2PPE is stabilized by half of the Hubbard U. Both intramolecular excitation and a minor metal-to-molecule electron-transfer excitation channel are observed.
引用
收藏
页码:5975 / 5981
页数:7
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