Issue 20, 2022

Temperature dependence in fast-atom diffraction at surfaces

Abstract

Grazing incidence fast atom diffraction at crystal surfaces (GIFAD or FAD) has demonstrated coherent diffraction both at effective energies close to one eV (λ ≈ 14 pm for He) and at elevated surface temperatures offering high topological resolution and real time monitoring of growth processes. This is explained by a favorable Debye-Waller factor specific to the multiple collision regime of grazing incidence. This paper presents the first extensive evaluation of the temperature behavior between 177 and 1017 K on a LiF surface. Similarly to diffraction at thermal energies (TEAS), an exponential attenuation of the elastic intensity is observed but, contrarily to TEAS, the maximum coherence is not directly reduced by the attraction forces that increase the effective impact energy. It is more influenced by the surface stiffness and appears very sensitive to surface defects.

Graphical abstract: Temperature dependence in fast-atom diffraction at surfaces

Article information

Article type
Paper
Submitted
18 fev 2022
Accepted
06 may 2022
First published
09 may 2022
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2022,24, 12319-12328

Temperature dependence in fast-atom diffraction at surfaces

P. Pan, M. Debiossac and P. Roncin, Phys. Chem. Chem. Phys., 2022, 24, 12319 DOI: 10.1039/D2CP00829G

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