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Self consistent calculations by N.D. Lang, A.R .Williams, Phys. Rev.B 18 (1978) 616,<br />
Cl, Si and Li atom adsorbed on jellium (r s =2), similarity to NA-resonances<br />
above: total electron density plots<br />
edge of the positive<br />
background<br />
Li Si Cl<br />
below: total electron density-minus superposition<br />
of atomic and bare metal electron density.<br />
Is it a Li ion in front of a sharp boundary or is it a polarised Li atom? This distinction is not unambiguously possible!<br />
∞<br />
However the surface averaged dipole moment d is still a good definition:<br />
d < 0 for electronegative adsorbates (e.g. Cl), d >0 for electropositive adsorbates e.g. Li<br />
d =−∫ ezδ<br />
n( r)<br />
d r<br />
One might call the SERS <strong>model</strong> of temporary charge transfer correctly the <strong>model</strong> of temporary<br />
change of the surface dipole moment, but I will not do that!<br />
−∞
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