A new elastic surface resonance was detected in the angular distributions of He atoms which were scattered from a (001) surface. This was identified as being due to coherent selective adsorption into one of the surface-bound states, followed by incoherent scattering from defects into the continuum. The reverse process was also detected.

A.Glebov, J.R.Manson, J.G.Skofronick, J.P.Toennies: Physical Review Letters, 1997, 78[8], 1508-11