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Helium, neon and argon diffraction from Ru(0001).

Research paper by M M Minniti, C C Díaz, J L JL Fernández Cuñado, A A Politano, D D Maccariello, F F Martín, D D Farías, R R Miranda

Indexed on: 18 Aug '12Published on: 18 Aug '12Published in: Journal of physics. Condensed matter : an Institute of Physics journal



Abstract

We present an experimental and theoretical study of He, Ne and Ar diffraction from the Ru(0001) surface. Close-coupling calculations were performed to estimate the corrugation function and the potential well depth in the atom-surface interaction in all three cases. DFT (density functional theory) calculations, including van der Waals dispersion forces, were used to validate the close-coupling results and to further analyze the experimental results. Our DFT calculations indicate that, in the incident energy range 20-150 meV, anticorrugating effects are present in the case of He and Ar diffraction, whereas normal corrugation is observed with Ne beams.