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STS and PES: Valence DOS

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Relaxation of the Chemical Bond

Part of the book series: Springer Series in Chemical Physics ((CHEMICAL,volume 108))

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Abstract

O and N adsorbates create commonly four DOS features in the valence band, corresponding to the host antibonding dipoles (>Ef), adsorbate non-bonding lone pairs (<Ef), electron holes of host (Ef), and the adsorbate–host bonding states. Electron holes and lone pair states may overlap and cancel each other. Dipole formation lowers the work function of the surfaces. Overdosing of adsorbates restores the work function as the dipoles serve as donor for further bond formation, which provide mechanism for surface antioxidation. Electronegativity, lattice size, dosage, and temperature are factors controlling bond and band formation and relaxation dynamics.

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  1. Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

    Chang Q. Sun

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Sun, C.Q. (2014). STS and PES: Valence DOS. In: Relaxation of the Chemical Bond. Springer Series in Chemical Physics, vol 108. Springer, Singapore. https://doi.org/10.1007/978-981-4585-21-7_4

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