Atoms Atom lasers Fast atom diffractions Intracycle interferences Ionization Laser-assisted Alkali halide surfaces Alkali halides Angular dispersions Ar atom Argon lasers Atomic beams Atomic hydrogen Bandgap materials COMERCIO EXTERIOR Charged particles Collision systems Condensed matter physics Crystallographic directions DICCIONARIOS BILINGUES Density functional theory Dielectric materials Dielectric models Diffraction Electric fields Electron gas Energy gap Focal volume Grazing incidence Hydrogen atoms