Mapping the Excited States of Single Hexa-peri-benzocoronene Oligomers
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- 作者：We-Hyo Soe ; Hon Seng Wong ; Carlos Manzano ; Maricarmen Grisolia ; Mohamed Hliwa ; Xinliang Feng ; Klaus M眉llen ; Christian Joachim
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：April 24, 2012
- 年：2012
- 卷：6
- 期：4
- 页码：3230-3235
- 全文大小：423K
- 年卷期：v.6,no.4(April 24, 2012)
- ISSN：1936-086X
文摘
Electronic states of a molecule are usually analyzed via their decomposition in linear superposition of multielectronic Slater determinants built up from monoelectronics molecular orbitals. It is generally believed that a scanning tunneling microscope (STM) is able to map those molecular orbitals. Using a low-temperature ultrahigh vacuum (LT-UHV) STM, the dI/dV conductance maps of large single hexabenzocoronene (HBC) monomer, dimer, trimer, and tetramer molecules were recorded. We demonstrate that the attribution of a tunnel electronic resonance to a peculiar 蟺 molecular orbital of the molecule (or 蟽 intermonomer chemical bond) in the STM junction is inappropriate. With an STM weak-measurement-like procedure, a dI/dV resonance results from the conductance contribution of many molecular states whose superposition makes it difficult to reconstruct an apparent molecular orbital electron probability density map.