title: Selective analysis of molecular states by functionalized scanning tunneling microscopy tips.
abstract: Selective analysis of molecular states in scanning tunneling microscopy (STM) has so far been achieved in a few cases by tuning the bias range of the STM in high-resolution measurements. Correspondingly, perylene adsorbed in a close-packed monolayer on Ag(110) is imaged mainly through the pi states of the molecule. By contrast, functionalizing the STM tip with a perylene molecule leads to a mismatch between the energy levels of the STM tip and the molecule adsorbates and, instead, images only the metal states of the underlying silver surface. The observation opens a route for better energy selectivity in electron transport measurements through organic interfaces.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China.
authors.forename: Z T
authors.initials: ZT
authors.lastname: Deng
authors.forename: H
authors.initials: H
authors.lastname: Lin
authors.forename: W
authors.initials: W
authors.lastname: Ji
authors.forename: L
authors.initials: L
authors.lastname: Gao
authors.forename: X
authors.initials: X
authors.lastname: Lin
authors.forename: Z H
authors.initials: ZH
authors.lastname: Cheng
authors.forename: X B
authors.initials: XB
authors.lastname: He
authors.forename: J L
authors.initials: JL
authors.lastname: Lu
authors.forename: D X
authors.initials: DX
authors.lastname: Shi
authors.forename: W A
authors.initials: WA
authors.lastname: Hofer
authors.forename: H-J
authors.initials: HJ
authors.lastname: Gao