Exciton dynamics at molecule-metal interfaces:: C60/Au(111) -: art. no. 045441

被引：55

作者：

Dutton, G ^{[1
]}

Quinn, DP ^{[1
]}

Lindstrom, CD ^{[1
]}

Zhu, XY ^{[1
]}

机构：

[1] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.72.045441

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Time-resolved two-photon photoemission spectroscopy is used to probe the energetics and dynamics of electronically excited states in epitaxial C-60 films on a single-crystal Au(111) surface. These measurements reveal a rich variety of excited states corresponding to excitons in C-60, charge transfer resonances at the metal-molecule interface, and image resonances on the surface. The lifetimes of excitons depend on the thickness of the C-60 film over a broad range; for the Frenkel exciton involving LUMO+1, the transient lifetime decreases from similar to 350 fs for film thickness > 30 monolayers to 80 fs at 2 monolayers. The long distance dependence is interpreted as due to the direct coupling between the electronic exciton band in C-60 and substrate metal bands.

引用

页数：11

共 57 条

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