Fast atom diffractions 28 Atoms 24 Diffraction 20 Initial value representation 12 Condensed matter physics 10 Projectiles 10 Density functional theory 8 Grazing scattering 8 Projectile distributions 8 Quantum interference 8 Surface scattering 8 Crystal surfaces 6 Eikonal approximations 6 Experimental spectra 6 Interference structures 6 Surface interactions 6 Atomic beams 4 Axial surface channeling 4 Beam collimation 4 Collision systems 4 Dissipative effects 4 Energy-loss spectrum 4 Grazing incidence 4 Inelastic contributions 4 Interference mechanisms 4 Lithium compounds 4 Potential Model 4 Projectile surface 4 Quantum approach 4 Quantum evolution 4