Electronic structure of 1 ML NTCDA/Ag(1 1 1) studied by photoemission spectroscopy
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- 作者：Azzedine Bendounan ; Frank Forster ; Achim Schö ; ll ; David Batchelor ; Johannes Ziroff ; Eberhard Umbach ; Friedrich Reinert
- 关键词：Angle resolved photoemission ; Resonant photoemission ; Surface electronic phenomena ; Organic molecules ; Organic films ; NTCDA
- 刊名：Surface Science
- 出版年：2007
- 出版时间：15 September 2007
- 年：2007
- 卷：601
- 期：18
- 页码：4013-4017
- 全文大小：424 K
文摘
We performed high-resolution photoemission experiments at different photon energies to investigate the valence band structure of 1 ML of 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTCDA) on Ag(1 1 1). Besides the known occupied molecular orbitals HOMO and HOMO − 1 we observe a new state close to the Fermi level, which results from the interaction between NTCDA and the substrate, partially filling the lowest unoccupied orbital of the free molecule (LUMO) in the monolayer system. By tuning the photon energy through the carbon K-edge, a resonance like change of the spectral intensity at the HOMO and HOMO − 1 energies is clearly revealed, which we use for an assignment of the individual spectral features to a predominant localization either at the naphthalene core or the anhydride group.