Phys. Rev. Lett. 91, 086104 (2003) [4 pages]Imaging the Internal Electronic Structure of a Surface Adsorbate with Low Energy IonsReceived 17 December 2002; published 21 August 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.086104
DOI:
10.1103/PhysRevLett.91.086104
PACS:
68.49.Sf, 68.43.–h, 73.90.+f, 79.20.Rf
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