Ab initio molecular orbital model of scanning tunneling microscopy

Taro Fujita, Hiromi Nakai, Hiroshi Nakatsuji

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Abstract

An ab initio model of scanning tunneling microscopy (STM) is presented in the framework of the perturbation theory of Bardeen. The tip and sample are represented by the cluster model, and the first-order wave functions are calculated by ab initio Hartree-Fock (HF), configuration interaction (CI), and symmetry adapted cluster (SAC)/SAC-CI methods. This model was applied to simple tip-sample systems such as Pd2-Ag2, Pd2-C6H6, Pd2-(C6H6)2, and Li2-Li2. The calculated STM images were related to the HOMO, LUMO, etc. orbital symmetries of the tip-sample systems. The contribution of the Rydberg orbital was examined at different tip-sample distances. Electron correlations were found to modify the behavior of the tunneling transition probability of the Li2-Li2 system vs that calculated by the HF method.

Original languageEnglish
Pages (from-to)2410-2417
Number of pages8
JournalJournal of Chemical Physics
Volume104
Issue number6
Publication statusPublished - 1996
Externally publishedYes

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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