Abstract
Through a systematic high-resolution study of the elastic bound state resonances observed in the inelastic background of the angular distributions of 4He scattering from the NaCl(001) surface, carried out at 90 K, we obtained clear and conclusive evidence that a deep level in the 4HeNaCl(001) interaction potential exists at −7.07 meV. Important deviations from the free-atom dispersion are observed, as expected for deep bound-state levels. We discuss the physical reasons why deep-level resonances, which are observed in inelastic scattering, may not be detectable in elastic scattering experiments. This finding appears to be crucial with respect to the theory of atom-surface potentials since former quantum-mechanical and close-coupling calculations excluded the existence of a deep level in 4HeNaCl(001) in agreement with elastic scattering studies but at odds with phenomenological predictions.
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