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Non-destructive quantum reflection of helium dimers and trimers from a plane ruled grating

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons22295

Zhang,  Weiqing
Molecular Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22079

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

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Citation

Zhao, B. S., Zhang, W., & Schöllkopf, W. (2013). Non-destructive quantum reflection of helium dimers and trimers from a plane ruled grating. Molecular Physics, 111(12-13), 1772-1780. doi:10.1080/00268976.2013.787150.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-F200-C
Abstract
We report on non-destructive scattering and diffraction of He, He2, and He3 from a plane ruled reflection grating. At grazing incidence the normal component of the particle’s wave-vector is sufficiently small to allow for quantum reflection at the attractive Casimir-van der Waals particle–surface interaction potential. Quantum reflection occurs tens of nanometers in front of the surface, before the dimers and trimers reach the region where the surface-induced forces would inevitably cause breakup of the fragile bonds. The reflected particles are identified via their mass-dependent diffraction angles and by mass spectrometry. The intensity distributions of the observed diffraction patterns are discussed in terms of the grating’s blaze angle.