“…For the off-normal incidence, maximum of the angular spectra shifts in the specular direction, and the emission becomes azimuthally asymmetric. ,,, The effect increases with the projectile size. ,, For instance, for cluster projectiles composed only of tens of atoms, such as C 60 , the shift is not visible and the angular spectra peak near the surface normal even during bombardment along the 45° incidence angle. ,, For large cluster projectiles, the effect is strong for small deviations from the normal incidence, but it becomes less pronounced at larger impact angles. ,, Increase of the incidence angle has two effects on the ejection process. The off-normal bombardment shortens the time necessary to disperse of the blocking cloud .…”