Surface and thin film analysis using Grazing Incidence Fast Atom Diffraction (GIFAD)

Details Surface and thin film analysis using Grazing Incidence Fast Atom Diffraction (GIFAD) Surface and thin film analysis using Grazing Incidence Fast Atom Diffraction (GIFAD)

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pobeo..84..142k&link_type=abstract

Publications of the Astronomical Observatory of Belgrade, vol. 84, pp. 142-142

Astronomy and Astrophysics

Astronomy

Scientific paper

Grazing collisions at surfaces offer rather contrasted conditions. For well ordered flat surfaces, the scattering is spread among several lattice sites, each of which produces only a tiny elementary deflection. If, in addition, the atomic projectile is aligned along a crystallographic direction, the surface appears as made of parallel furrows which act as a diffraction grating for the atomic wave. We will show that the analysis of characteristic diffraction pattern recorded on the position sensitive detector located downstream allow a sensitive measure of the shape of the surface electronic density. At variance, if a terrace edge or an ad-atom is sitting on the surface along the trajectory, a quasi-binary collision will follow in which energy and momentum conservation allow identification of the mass of the collision partner.

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