Figure 1 Illustration of quantum mechanically modelled He-Rh(311) scattering (atomic units are used). Probability density function split into slices parallel to the solid surface.  are the moment in the direction x and y, respectively. (A) and (B) Probability density function (PDF) is shown in the real space and in the momentum space, respectively when the wave-packet is near the classical turning point (, z=2.62). The radius of the circle in the origin is 3.74 (a.u.). (C) and (D) PDF is shown in the real and the momentum space when the wave-packet is at the detector region. The radius of the circle in the origin is 3.74 (a.u.).