Imaging the internal electronic structure of a surface adsorbate with low energy ions

Imaging the internal electronic structure of a surface adsorbate with low energy ions

Time-of-flight spectra were collected for 2.5 keV 7Li+ backscattered from Fe surfaces covered with submonolayers of iodine. Li singly scattered from the adatoms has a consistently larger neutral fraction than for scattering from the substrate, implying a region of positive charge atop the iodine. Th...

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Veröffentlicht in:Physical review letters 2003-08, Vol.91 (8), p.086104-086104, Article 086104
Hauptverfasser: Yarmoff, Jory A, Yang, Ye, Sroubek, Zdenek
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container_title Physical review letters
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creator Yarmoff, Jory A
Yang, Ye
Sroubek, Zdenek
description Time-of-flight spectra were collected for 2.5 keV 7Li+ backscattered from Fe surfaces covered with submonolayers of iodine. Li singly scattered from the adatoms has a consistently larger neutral fraction than for scattering from the substrate, implying a region of positive charge atop the iodine. The neutral fraction decreases for off-normal exit angles, indicating a nonuniform charge distribution around the polarizable adsorbates. This demonstrates that ion scattering can image the internal electronic structure of an adatom and provides an explanation for anomalous work function changes.
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title Imaging the internal electronic structure of a surface adsorbate with low energy ions
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