Visualization of Covalent Bonding between NO Molecules on Cu(110)

  • Akitoshi ShiotariEmail author
Part of the Springer Theses book series (Springer Theses)


Using STM at 6 K, the valence states of NO molecules adsorbed monomerically on Cu(110) upon deposition at about 15 K were investigated. The NO monomer was found to be bonded at the short-bridge site in an upright configuration. An STM image of the monomer appears as a dumbbell-shaped protrusion, corresponding to the shape of the \(2\pi ^*\) orbital aligned in the [1–10] direction. In contrast, the resonance state of the \(2\pi ^*\) orbital in the [001] direction is located about 0.4 eV above the Fermi level. Although the double degeneracy of the NO \(2\pi ^*\) orbital is lifted by the interaction with the anisotropic surface, the mixing of the NO \(2\pi ^*\) and the Cu d band is relatively weak and the two orthogonal \(2\pi ^*\) valence states are still localized on the molecule. Two isolated NO molecules on the surface were manipulated to approach each other closely along the [1–10] direction, and, at the separation less than 5.12 Å, the resonance states of the \(2\pi ^*\) orbital in the [1–10] direction split, modifying the shape of the STM image. This result demonstrates the covalent interactions between two NO molecules are controlled by manipulating the overlap of their “active” \(2\pi ^*\) orbitals.


Valence orbitals Covalent bonding Scanning tunneling microscopy 


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© Springer Nature Singapore Pte Ltd. 2017

Authors and Affiliations

  1. 1.The University of TokyoKashiwaJapan

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