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Diffraction patterns produced by grazing scattering of fast atoms frominsulator surfaces are used to examine the atom-surface interaction. The methodis applied to He atoms colliding with a LiF(001) surface along axialcrystallographic channels. The projectile-surface potential is obtained from anaccurate DFT calculation, which includes polarization and surface relaxation.For the description of the collision process we employ the surface eikonalapproximation, which takes into account quantum interference between differentprojectile paths. The dependence of projectile spectra on the parallel andperpendicular incident energies is experimentally and theoretically analyzed,determining the range of applicability of the proposed model.

He-LiF surface potential from fast atom diffraction under grazing incidence