Physical Review Letters ( IF 8.385 ) Pub Date :
G. A. Bocan; H. Breiss; S. Szilasi; A. Momeni; E. M. Staicu Casagrande; M. S. Gravielle; E. A. Sánchez; H. Khemliche

We present theoretical and experimental evidence of an anomalous surface corrugation behavior in He-KCl(001) for incidence along $⟨110⟩$. When the He normal energy decreases below 100 meV, i.e. He-surface distances $Z>2$ , the corrugation unexpectedly increases up to an impressive \$\$85%. This is not due to van der Waals interactions but to the combination of soft potential effects and the evolution of He-cation and He-anion interactions with $Z$. This feature, not previously analyzed on alkali-halide surfaces, may favor the alignement properties of weakly-interacting overlayers.

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