Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 12, Issue 1, Pages L13-L19Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/12/1/103
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The adsorbate-adsorbate interaction mediated by Shockley surface states on, for example, the (1 1 1) faces of noble metals, yields an oscillatory form modulated by a 1/d(2) envelope at asymptotic adsorbate separations d. For this interaction we obtain a non-perturbative analytical estimate, specified by experimentally accessible Shockley-state parameters and the finite Fermi-level phase shift delta(F) not equal 0, which characterize the standing-wave patterns observed in scanning tunnelling microscopy (STM) images. We provide explicit interaction results for the phase shift value delta(F) = -pi/2 suggested by the STM measurements of sulphur adsorbates on Cu(111), and we attempt to relate our results to the corresponding observations of correlations in the adsorbate distribution function.
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