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Coherent reflection of He atom beams from rough surfaces at grazing incidence

MPS-Authors
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Zhao,  Bum Suk
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Schewe,  Christian
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Meijer,  Gerard
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Schöllkopf,  Wieland
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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1005.3711v1.pdf
(Preprint), 184KB

e133203.pdf
(Publisher version), 313KB

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Citation

Zhao, B. S., Schewe, C., Meijer, G., & Schöllkopf, W. (2010). Coherent reflection of He atom beams from rough surfaces at grazing incidence. Physical Review Letters, 105(13), 133203-1-133203-4. doi:10.1103/PhysRevLett.105.133203.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-F4FD-E
Abstract
We report coherent reflection of thermal He atom beams from various microscopically rough surfaces at grazing incidence. For a sufficiently small normal component kz of the incident wave- vector of the atom the reflection probability is found to be a function of kz only. This behavior is explained by quantum-reflection at the attractive branch of the Casimir-van der Waals interaction potential. For larger values of kz the overall reflection probability decreases rapidly and is found to also depend on the parallel component kx of the wave-vector. The material specific kx dependence for this classic reflection at the repulsive branch of the potential is discussed in terms of an averaging- out of the surface roughness under grazing incidence conditions.