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Title of article :
High resolution scanning-tunneling-microscopy imaging of individual molecular orbitals by eliminating the effect of surface charge
Author/Authors :
Cheng، نويسنده , , Z.H. and Du، نويسنده , , S.X. and Jiang، نويسنده , , N. and Zhang، نويسنده , , Y.Y. and Guo، نويسنده , , W. A. Hofer، نويسنده , , W.A. and Gao، نويسنده , , H.-J.، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2011
Pages :
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Abstract :
Ultrathin Iron(II) Phthalocyanine (FePc) monolayers have been employed to decouple individual FePc molecules electronically from the metallic substrate, which allows the intrinsic electronic structure of the free molecule to be preserved and imaged by means of low-temperature scanning tunneling microscopy (STM). High-resolution images reveal the standard “cross” structure for molecules adsorbed at the metal surface, but a detailed electronic structure, corresponding to the highest occupied molecular state (HOMO), for molecules adsorbed at the buffer layer. Different STM images of the molecules in the first and second layer are referred to different interactions between molecules and substrate. This interpretation is verified by control experiments on a second molecule, tetra-tert-butyl zinc Phthalocyanine ((t-Bu)4ZnPc). We therefore conclude that this effect is generic and can be used to investigate a moleculeʹs electronic structure in detail.
Keywords :
High resolution STM imaging , Metal phthalocyanine , Molecular electronic structures , Buffer layer , density functional theory calculation
Journal title :
Surface Science
Journal title :
Surface Science
Serial Year :
Link To Document :