Coherent Reflection of He Atom Beams from Rough Surfaces at Grazing Incidence

Bum Suk Zhao (조범석), H. Christian Schewe, Gerard Meijer, and Wieland Schöllkopf
Phys. Rev. Lett. 105, 133203 – Published 24 September 2010

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.

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  • Received 20 November 2009

DOI:https://doi.org/10.1103/PhysRevLett.105.133203

© 2010 The American Physical Society

Authors & Affiliations

Bum Suk Zhao (조범석), H. Christian Schewe, Gerard Meijer, and Wieland Schöllkopf*

  • Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

  • *wschoell@fhi-berlin.mpg.de

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Issue

Vol. 105, Iss. 13 — 24 September 2010

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