Transition from quantum to classical projectile distributions for atom-surface scattering: the spot-beam effect

M. S. GRAVIELLE; J. E. MIRAGLIA; L. FRISCO

Deauville

Conferencia; XXXI International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC); 2019

International Committee of ICPEAC

For grazing incidence fast atom diffraction (GIFAD), the spot-beam effect associated with the contribution coming from different positions of the focus point of the incident particles is studied. Such a focusing effect allows projectiles to explore different zones of a single crystallographic channel when a narrow surface area is coherently lighted. In addition, the spot-beam effect contributes to deteriorate the quantum coherence of GIFAD, affecting the visibility of the interference patterns and leading to the gradual quantum-classical transi-tion of the spectra.